77 results on '"Bertrand curves"'
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2. Spacelike Bertrand curves in Minkowski 3-space revisited
- Author
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Erdem Hatice Altın and İlarslan Kazım
- Subjects
minkowski 3-space ,bertrand curves ,non-null curves ,53c50 ,53c40 ,Mathematics ,QA1-939 - Abstract
In the geometry of curves in 𝔼3, if the principal normal vector field of a given space curve ϕ with non-zero curvatures is the principal normal vector field of another space curve ϕ*, then the curve ϕ is called a Bertrand curve and ϕ* is called Bertrand partner of ϕ. These curves have been studied in di erent space over a long period of time and found wide application in di erent areas. Therefore, we have a great knowledge of geometric properties of these curves. In this paper, revested results for spacelike Bertrand curves with non-null normal vectors will be given with the previous studies on Bertrand curves in 𝔼13. Follow this revested results, the Bertrand curve conditions of a spacelike curve are obtained in 𝔼13. In addition, new curve samples that meet the obtained conditions are constructed and the graphs of these curves are given.
- Published
- 2023
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3. ON SPECIAL SINGULAR CURVE COUPLES OF FRAMED CURVES IN 3D LIE GROUPS.
- Author
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DOĞAN YAZICI, Bahar, OKUYUCU, Osman Zeki, and TOSUN, Murat
- Subjects
- *
LIE groups , *COUPLES - Abstract
In this paper, we introduce Bertrand and Mannheim curves of framed curves, which are a special singular curve in 3D Lie groups. We explain the conditions for framed curves to be Bertrand curves and Mannheim curves in 3D Lie groups. We give relationships between framed curvatures and Lie curvatures of Bertrand and Mannheim curves of framed curves. In addition, we obtain the characterization of Bertrand and Mannheim curves according to the various frames of framed curves in 3D Lie groups. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
4. Forming coupled dispersionless equations of families of Bertrand curves.
- Author
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EREN, Kemal
- Subjects
- *
EQUATIONS of motion , *CONSERVED quantity , *EQUATIONS , *LAX pair - Abstract
In this study, we establish a link of the coupled dispersionless (CD) equations system with the motion of Bertrand curve pairs. Moreover, we find the Lax equations that provide the integrability of these equations. By taking an appropriate choice of variables we show the link of the short pulse (SP) equation with the motion of Bertrand curve pairs via the reciprocal (hodograph) transformation. Finally, we prove that the conserved quantity of the corresponding coupled dispersionless equations obtained from each of these curve pairs is constant. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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5. BERTRAND PARTNER P-TRAJECTORIES IN THE EUCLIDEAN 3-SPACE E³.
- Author
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İŞBİLİR, Zehra, ÖZEN, Kahraman Esen, and TOSUN, Murat
- Subjects
- *
KINEMATICS - Abstract
The concept of a pair of curves, called as Bertrand partner curves, was introduced by Bertrand in 1850. Bertrand partner curves have been studied widely in the literature from past to present. In this study, we take into account of the concept of Bertrand partner trajectories according to Positional Adapted Frame (PAF) for the particles moving in 3-dimensional Euclidean space. Some characterizations are given for these trajectories with the aid of the PAF elements. Then, we obtain some special cases of these trajectories. Moreover, we provide a numerical example. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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6. Surface Family with Bertrand Curves as Joint Asymptotic Curves in 3D Galilean Space
- Author
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Awatif Al-Jedani and Rashad A. Abdel-Baky
- Subjects
isotropic normal ,Bertrand curves ,marching-scale functions ,Mathematics ,QA1-939 - Abstract
The primary objective of this work is to discuss a surface family with the similarity of Bertrand curves in 3D Galilean space. Subsequently, by applying the Serret–Frenet frame, we estimate the sufficient and necessary statuses of a surface family with Bertrand curves as joint asymptotic curves. The dilation to ruled surfaces is also summarized. Meanwhile, the epitomes are illustrated to provide an explanation of the theoretical results.
- Published
- 2023
- Full Text
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7. A New Class of Bertrand Curves in Euclidean 4-Space.
- Author
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Li, Yanlin, Uçum, Ali, İlarslan, Kazım, and Camcı, Çetin
- Subjects
- *
SYMMETRY , *CURVATURE - Abstract
Bertrand curves are a pair of curves that have a common principal normal vector at any point and are related to symmetry properties. In the present paper, we define the notion of 1 , 3 -V Bertrand curves in Euclidean 4-space. Then we find the necessary and sufficient conditions for curves in Euclidean 4-space to be 1 , 3 -V Bertrand curves. Some related examples are given. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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8. Bertrand and Mannheim Curves of Spherical Framed Curves in a Three-Dimensional Sphere.
- Author
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Takahashi, Masatomo and Yu, Haiou
- Subjects
- *
DIFFERENTIAL geometry - Abstract
We investigated differential geometries of Bertrand curves and Mannheim curves in a three-dimensional sphere. We clarify the conditions for regular spherical curves to become Bertrand and Mannheim curves. Then, we concentrate on Bertrand and Mannheim curves of singular spherical curves. As singular spherical curves, we considered spherical framed curves. We define Bertrand and Mannheim curves of spherical framed curves. We give conditions for spherical framed curves to become Bertrand and Mannheim curves. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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9. On spinor construction of Bertrand curves
- Author
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Tülay Erişir
- Subjects
spinors ,bertrand curves ,Mathematics ,QA1-939 - Abstract
Spinors permeate all of modern physics and have also an important place in mathematics. Spinors are used intensively in modern theoretical physics and differential geometry. In this study, spinors are used for a different representation of differential geometry in E3. The goal of this study is also the spinor structure lying at the basis of differential geometry. In this paper, firstly, spinors are introduced algebraically. Then, the spinor construction of Bertrand curves is defined. Moreover, the angle notion for these spinors is given. In this way, a different geometric construction of spinors is established in this paper.
- Published
- 2021
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10. A New Class of Bertrand Curves in Euclidean 4-Space
- Author
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Yanlin Li, Ali Uçum, Kazım İlarslan, and Çetin Camcı
- Subjects
Bertrand curves ,curvatures ,Euclidean space ,Mathematics ,QA1-939 - Abstract
Bertrand curves are a pair of curves that have a common principal normal vector at any point and are related to symmetry properties. In the present paper, we define the notion of 1,3-V Bertrand curves in Euclidean 4-space. Then we find the necessary and sufficient conditions for curves in Euclidean 4-space to be 1,3-V Bertrand curves. Some related examples are given.
- Published
- 2022
- Full Text
- View/download PDF
11. Bertrand and Mannheim Curves of Spherical Framed Curves in a Three-Dimensional Sphere
- Author
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Masatomo Takahashi and Haiou Yu
- Subjects
Bertrand curves ,Mannheim curves ,spherical regular curves ,spherical framed curves ,singularity ,Mathematics ,QA1-939 - Abstract
We investigated differential geometries of Bertrand curves and Mannheim curves in a three-dimensional sphere. We clarify the conditions for regular spherical curves to become Bertrand and Mannheim curves. Then, we concentrate on Bertrand and Mannheim curves of singular spherical curves. As singular spherical curves, we considered spherical framed curves. We define Bertrand and Mannheim curves of spherical framed curves. We give conditions for spherical framed curves to become Bertrand and Mannheim curves.
- Published
- 2022
- Full Text
- View/download PDF
12. A new approach to Bertrand curves in Euclidean 3-space.
- Author
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Camci, Çetin, Uçum, Ali, and İlarslan, Kazım
- Abstract
In this article, a new approach is given for Bertrand curves in 3-dimensional Euclidean space. According to this approach, the necessary and sufficient conditions including the known results have been obtained for a curve to be Bertrand curve in E 3 . In addition, the related examples and graphs are given by showing that general helices and anti-Salkowski curves can be Bertrand curves or their mates, which is their new characterization. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
13. The Geometrical Characterizations of the Bertrand Curves of the Null Curves in Semi-Euclidean 4-Space
- Author
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Jianguo Sun and Yanping Zhao
- Subjects
Frenet equations ,null curves ,Bertrand curves ,semi-Euclidean space ,curvatures ,Mathematics ,QA1-939 - Abstract
According to the Frenet equations of the null curves in semi-Euclidean 4-space, the existence conditions and the geometrical characterizations of the Bertrand curves of the null curves are given in this paper. The examples and the graphs of the Bertrand pairs with two different conditions are also given in order to supplement the conclusion of this paper more intuitively.
- Published
- 2021
- Full Text
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14. Characterizations of Bertrand Curves in Finsler 3-Manifold.
- Author
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ATES, Fatma, OZDEMIR, Zehra, and EKMEKCI, F. Nejat
- Subjects
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CURVES , *FINSLER spaces - Abstract
In this study, we give the linear condition for the Bertrand curve of a given curve in Finslerian 3- space. Using the Izumiya and Takeuchi's paper as an inspiration, Bertrand curves of Finslerian spherical curves are defined according to Randers metric which is a special Finslerian metric. Also, we obtain the Finsler helix derived from the Finslerian circle according to Randers metric and their visualizations are given by using the Mathematica program. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
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15. Singular Special Curves in 3-Space Forms
- Author
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Jie Huang and Donghe Pei
- Subjects
Bertrand curves ,Mannheim curves ,space forms ,singularities ,Mathematics ,QA1-939 - Abstract
We study the singular Bertrand curves and Mannheim curves in the 3-dimensional space forms. We introduce the geometrical properties of such special curves. Moreover, we get the relationships between singularities of original curves and torsions of another mate curves.
- Published
- 2020
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16. Isotropic Curves and Their Characterizations in Complex Space C4.
- Author
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YILMAZ, SÜHA, SAVCI, ÜMİT ZİYA, and AKBIYIK, MÜCAHİT
- Subjects
- *
ISOTROPIC properties , *CURVES , *MATHEMATICAL analysis , *DIFFERENTIAL equations , *NUMERICAL analysis - Abstract
In this study, we investigate the classical differential geometry of isotropic curves in the complex space C4. We examine the constant breadth of isotropic curves and obtain some results regarding these isotropic curves. We express some characterizations of these curves via the É. Cartan derivative formula. We also indicate that the isotropic vector of these curves and pseudo curvature satisfy a third order vector differential equation with variable coefficients. We study this differential equation in some special cases. We dene evolute and involute of the isotropic curve and express some characterizations of these curves in terms of É. Cartan equations. The isotropic rectifying curve and isotropic helix are characterized in C4. Finally, we present the conditions for an isotropic curve to be an isotropic helix. [ABSTRACT FROM AUTHOR]
- Published
- 2018
17. 3-Boyutlu öklid uzayında bertrand eğriler ve bishop çatısı.
- Author
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Masal, Melek and Azak, Ayşe Zeynep
- Abstract
In this paper, the geometric meanings of the curvatures belong to Bishop frame, which was defined by L.R. Bishop in 1975, has been given. Afterwards, the relations between the Bishop vectors of Bertrand curve couple, which Bertrand defined in 1850, has been obtained. Furthermore, some interesting results have been found when these curves become parallel curves. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
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18. On the differential geometric elements of bertrandian darboux ruled surface in E3.
- Author
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Kılıçoğlu, Şeyda and Şenyurt, Süleyman
- Subjects
- *
RULED surfaces , *DARBOUX transformations - Abstract
In this paper, we consider two special ruled surfaces associated to a Bertrand curve α and Bertrand mate α* . First, Bertrandian Darboux Ruled surface with the base curve a has been defined and examined in terms of the Frenet- Serret apparatus of the curve α , in E3 . Later, the differential geometric elements such as, Weingarten map S, Gaussian curvature K and mean curvature H, of Bertrandian Darboux Ruled the surface and Darboux ruled surface has been examined relative to each other. Further, first, second and third fundamental forms of Bertrandian Darboux Ruled surface have been investigated in terms of the Frenet apparatus of Bertrand curve α , too. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
19. On the differential geometric elements of bertrandian darboux ruled surface in E3.
- Author
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Kılıçoğlu, Şeyda and Şenyurt, Süleyman
- Subjects
RULED surfaces ,DARBOUX transformations - Abstract
Copyright of Sakarya University Journal of Science (SAUJS) / Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi is the property of Sakarya University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2017
- Full Text
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20. AN EXAMINATION ON HELIX AS INVOLUTE, BERTRAND MATE AND MANNHEIM PARTNER OF ANY CURVE α IN E3.
- Author
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SŞENYURT, SÜLEYMAN and KILIÇOĞLU, ŞEYDA
- Subjects
- *
HELICES (Algebraic topology) , *CURVES , *MATHEMATICS theorems , *MATHEMATICAL programming , *METRIC spaces , *MATHEMATICAL models - Abstract
In this study we consider three offset curves of a curve α such as the involute curve α*, Bertrand mate α1 and Mannheim partner α2. We examined and find the conditions of Frenet apparatus of any curve α which has the involute curve α*, Bertrand mate α1 and Mannheim partner α2 are the general helix. [ABSTRACT FROM AUTHOR]
- Published
- 2017
21. BERTRAND CURVES IN THREE DIMENSIONAL LIE GROUPS.
- Author
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ZEKI OKUYUCU, O., GÖK, İMAİL, YAYLI, YUSUF, and EKMEKCI, NEJAT
- Subjects
- *
LIE groups , *BERTRAND'S theorem , *BERTRAND'S method , *CURVATURE , *TOPOLOGICAL groups , *SYMMETRIC spaces - Abstract
In this paper, we give the definition of harmonic curvature function some special curves such as helix, slant curves, Mannheim curves and Bertrand curves. Then, we recall the characterizations of helices [7], slant curves (see [19]) and Mannheim curves (see [12]) in three dimensional Lie groups using their harmonic curvature function. Moreover, we define Bertrand curves in a three dimensional Lie group G with a bi-invariant metric and the main result in this paper is given as (Theorem 7): A curve α: I ⊂R͛4G with the Frenet apparatus {T,N,B,κ,τ}is a Bertrand curve if and only if λκ+μκH = 1 where λ, μ are constants and H is the harmonic curvature function of the curve α. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
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22. Some properties of Bertrand curves in Lorentzian -space.
- Author
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Tanriöver, Necmettin
- Subjects
- *
CURVES , *LORENTZ spaces , *DERIVATIVES (Mathematics) , *HELICES (Algebraic topology) , *MATHEMATICAL analysis - Abstract
In this paper, Bertrand curves in -dimensional Lorentz space are defined and some of their properties are determined. Various relationships and characterizations are found between higher order curvatures and their derivatives for Bertrand curve pair. In addition, some relationships are obtained between these curves and general helix, harmonic curvature. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
23. Generalized Null Bertrand Curves In Minkowski Space-Time.
- Author
-
Aksoyak, Ferdag Kahraman, Gok, Ismail, and Ilarslan, Kazim
- Subjects
- *
MINKOWSKI geometry , *MINKOWSKI space , *MATHEMATICAL constants , *BERTRAND'S method , *SPACE-time mathematical models - Abstract
Çöken and ÇIFTCI proved that a null Cartan curve in Minkowski space-time E41 is a null Bertrand curve if and only if k2 is nonzero constant and k3 is zero. That is, the null curve with non-zero curvature k2 is not a Bertrand curve in Minkowski space-time E41. So, in this paper we defined a new type of Bertrand curve in Minkowski space-time E41 for a null curve with non-zero curvature k3 by using the similar idea of generalized Bertrand curve given by Matsuda and Yorozu and we called it a null (1, 3)-Bertrand curve. Also, we proved that if a null curve with non-zero curvatures in Minkowski space-time E41 is a null (1, 3)-Bertrand curve then it is a null helix. We give an example of such curves. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
24. A new approach to Bertrand curves in Euclidean 3-space
- Author
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Ali Uçum, Kazım İlarslan, Çetin Camci, and KKÜ
- Subjects
Computer Science::Computer Science and Game Theory ,Euclidean space ,Mathematics::History and Overview ,010102 general mathematics ,0211 other engineering and technologies ,02 engineering and technology ,Characterization (mathematics) ,Space (mathematics) ,01 natural sciences ,Combinatorics ,Bertrand curves ,General helices ,Euclidean geometry ,Geometry and Topology ,0101 mathematics ,Anti-Salkowski curves ,Euclidean 3-space ,021101 geological & geomatics engineering ,Mathematics - Abstract
In this article, a new approach is given for Bertrand curves in 3-dimensional Euclidean space. According to this approach, the necessary and sufficient conditions including the known results have been obtained for a curve to be Bertrand curve in $${\mathbb {E}}^{3}$$ . In addition, the related examples and graphs are given by showing that general helices and anti-Salkowski curves can be Bertrand curves or their mates, which is their new characterization.
- Published
- 2020
25. Hélices generalizadas e curvas de Bertrand.
- Author
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Flores, Márcia Viaro and Pansonato, Claudia Candida
- Abstract
A circular helix is characterized by having constant curvature κ ≠ = 0 and constant torsion τ. If the ratio τ/κ is constant, the curve is called generalized helix. A curve γ : I → R³ is called a Bertrand curve if there is another curve κ/γ : I → R³ such that the normal lines of γ and ... at s ε I are equal. Generalized helices and Bertrand curves can be viewed as generalizations of the circular helix. In this work we review the concepts and results on helices and Bertrand curves. Besides, some examples of these curves are plotted. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
26. q-çatı ve geometrik uygulamaları
- Author
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Erdoğan Doğan, Ayten, Yıldırım Yılmaz, Münevver, and Matematik Anabilim Dalı
- Subjects
Matematik ,Bertrand curves ,Mathematics - Abstract
Bu çalışmada q- çatı ve özellikleri incelenerek; q- çatının diğer bazı çatılara göre avantajları ele alınmıştır. q-çatı kullanılarak yönlü Bertrand eğri kavramı incelenmiştir.Yönlü involüt-evolüt eğri çifti ve yönlü rektifiyen eğriler tanımlanarak özellikleri ifade edilmiştir. In this thesis q-frame and its properties are studied.In addition we have deal with the advantages of this frame to other ones. Directional Bertrand offset curves are examined via q-frame.Directional involute-evolute curves and directional rectifying curves are defined and also their characterizations are given. 44
- Published
- 2020
27. Minkowski Uzayında Bertrand Eğrileri ve Hiperbolik Spinorlar
- Author
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Köse Öztaş, Hilal, Erişir, Tülay, and Matematik Anabilim Dalı
- Subjects
Matematik ,Bertrand curves ,Minkowski space ,Spinor ,Mathematics - Abstract
Daha sonra doldurulacaktır. Daha sonra doldurulacaktır. 0
- Published
- 2020
28. Minkowski 3-uzayında v-bertrand eğri çiftleri
- Author
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Bilgin, Burhan, Camcı, Çetin, and Matematik Ana Bilim Dalı
- Subjects
Matematik ,Bertrand curves ,Semi euclidean spaces ,Differential geometry ,Mathematics - Abstract
Bu tez beş bölümden oluşmaktadır. İlk bölüm giriş kısmıdır. İkinci bölümde, Öklid 3-uzayı ve Minkowski 3-uzayındaki temel kavramlar verilmiştir. Üçüncü bölümde, Minkowski 3-uzayında zamansı V-Bertrand eğri çiftleri tanımlanmış, bunlar karakterize edilmiş ve özellikleri incelenmiştir. Dördüncü bölümde ise, Minkowski 3-uzayında ışıksı-uzaysı V-Bertrand eğri çiftleri tanımlanmış, bunlar karakterize edilmiş ve özellikleri incelenmiştir. Son olarak, Minkowski 3-uzayında V-Bertrand eğri çiftleri ile ilgili bir tartışmaya yer verilmiştir. This thesis consists of five chapters. The first section is the introduction. In Section 2, basic concepts in Euclidean 3-space and Minkowski 3-space have been given. In Section 3, the timelike V-Bertrand curve pairs in Minkowski 3-space are defined, characterized and their properties are examined. In Section 4, pairs of null-spacelike V-Bertrand curves in Minkowski 3-space are defined, characterized and their properties are examined. Finally, we discuss V-Bertrand curve pairs defined in Minkowski 3-space. 61
- Published
- 2020
29. 3-boyutlu Galile uzayında sabit sırt uzaklıklı eğriler ve bu eğrilerin Smarandache eğrileri
- Author
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Gürgar, İshak, Çakmak, Ali, and Matematik Ana Bilim Dalı
- Subjects
Matematik ,Bertrand curves ,Involute-evolute curves ,Galilean Space ,Mathematics - Abstract
Bu tez çalışmasında öncelikle 3-boyutlu Galile uzayıyla alakalı temel tanım ve teoremler verilmiştir. Sonra, Galile uzayı ve Öklid uzayında bazı özel eğrilerin tanımları ve özellikleri belirtilmiştir. Daha sonra sabit sırt uzaklı eğriler ve Bertrand, involüt-evolüt, Mannheim ve Smarandache eğrileri arasında ilişkiler kurulmuştur. Son bölümde örnekler verilerek, konu görsellerle desteklenmiş aynı zamanda bulunan sonuçlar somutlaştırılmıştır. In this thesis, firstly, basic definitions and theorems related to 3-dimensional Galilean space are given. Then, the definitions and properties of some special curves in Galile space and Euclidean space are specified. Later, relations between the curves at a constant distance from the edge of regression and Bertrand, involute-evolute, Mannheim and Smarandache curves are established. In the last section, by giving examples, the subject is supported with visuals and the results are concretized. 64
- Published
- 2020
30. A NOTE ON BERTRAND CURVES AND CONSTANT SLOPE SURFACES ACCORDING TO DARBOUX FRAME.
- Author
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Babaarslan, Murat, Tandogan, Yusuf Ali, and Yayali, Yusuf
- Subjects
- *
CURVES , *DARBOUX transformations , *EUCLIDEAN metric , *SPHERICAL functions , *ALGEBRAIC surfaces - Abstract
In [Int. J. Phys. Sci., 6(2011), No. 8, 1868-1875], Babaarslan and Yayli studied constant slope surfaces and Bertrand curves in Euclidean 3-space. They found parametrization of constant slope surfaces for spherical indicatrices of a space curve. Furthermore, they investigated Bertrand curves corresponding to parameter curves of constant slope surfaces. In this work, we give some different characterizations of Bertrand curves and constant slope surfaces with respect to the Darboux frame. Subsequently, we express some interesting relations and illustrate some examples of our main results. [ABSTRACT FROM AUTHOR]
- Published
- 2012
31. New Characterizations for Bertrand Curves in Minkowski 3-Space.
- Author
-
Bukcu, Bahaddin, Karacan, Murat Kemal, and Yuksel, Nural
- Subjects
- *
CURVES , *GENERALIZED spaces , *MATHEMATICAL programming , *VECTOR analysis , *NUMERICAL analysis , *MATHEMATICAL optimization - Abstract
Bertrand curves have been investigated in Lorentzian and Minkowski spaces and some characterizations have been given in [1,2,6]. In this paper, we have investigated the relations between Frenet vector fields and curvatures and torsions of Bertrand curves at the corresponding points in Minkowski 3-space. [ABSTRACT FROM AUTHOR]
- Published
- 2011
32. An application of Ritt-Wu's zero decomposition algorithm to the pseudo null Bertrand type curves in Minkowski 3-space.
- Author
-
İlarslan, Kazım and Yildirim, Mehmet
- Abstract
The Bertrand curves were first studied using a computer by Wu (1987). The same problem was studied using an improved version of Ritt-Wu's decomposition algorithm by Chou and Gao (1993). This paper investigates the same problem for pseudo null Bertrand curves in Minkowski 3-space $$ \mathbb{E}_1^3 $$. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
33. Bertrand curves of AW(k)-type in Lorentzian space
- Author
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Külahcı, Mihriban and Ergüt, Mahmut
- Subjects
- *
ALGEBRAIC curves , *LORENTZ spaces , *GEODESICS , *NONLINEAR statistical models , *MATHEMATICAL analysis , *CURVATURE - Abstract
Abstract: In this study, firstly, we give curvature conditions of AW(k)-type () curves. Then considering AW(k)-type curves, we investigate Bertrand curves with and . We show that there are Bertrand curves of AW(1)-type and AW(3)-type. Moreover, we study weak AW(2)-type and AW(3)-type conical geodesic curves in . [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
34. The Geometrical Characterizations of the Bertrand Curves of the Null Curves in Semi-Euclidean 4-Space.
- Author
-
Sun, Jianguo and Zhao, Yanping
- Subjects
- *
EQUATIONS , *CURVATURE - Abstract
According to the Frenet equations of the null curves in semi-Euclidean 4-space, the existence conditions and the geometrical characterizations of the Bertrand curves of the null curves are given in this paper. The examples and the graphs of the Bertrand pairs with two different conditions are also given in order to supplement the conclusion of this paper more intuitively. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
35. On the integrability of Bertrand curves and Razzaboni surfaces
- Author
-
Schief, W.K.
- Subjects
- *
CURVES , *SOLITONS - Abstract
Based on classical but apparently little known results due to Razzaboni, the integrable nature of Bertrand curves and their geodesic embedding in surfaces is discussed in the context of modern soliton theory. The existence of parallel Razzaboni surfaces which constitute the surface analogues of the classical offset Bertrand mates is recorded. It is shown that the natural geodesic coordinate systems on Razzaboni surfaces and their mates are related by a reciprocal transformation. The geodesic coordinate system on the Razzaboni transform generated by a Ba¨cklund transformation is given explicitly in terms of Razzaboni’s pseudopotential obeying a compatible Frobenius system. The Razzaboni transformation and the duality transformation which links a Razzaboni surface and its mate are proven to commute. A canonical quantity introduced by Razzaboni is recognized as an invariant of the Razzaboni and duality transformations. Finally, Razzaboni surfaces are shown to be amenable to the Sym–Tafel formula. [Copyright &y& Elsevier]
- Published
- 2003
- Full Text
- View/download PDF
36. Üç boyutlu minkowski uzayında açılabilir olmayan regle yüzeylerin striksiyon çizgileri üzerine
- Author
-
Çakar, Songül, Çakmak, Ali, and Matematik Ana Bilim Dalı
- Subjects
Matematik ,Bertrand curves ,Timelike ruled surfaces ,Minkowski space ,Spacelake ruled surfaces ,Mathematics - Abstract
Bu tez çalışmasında öncelikle Lorentz-Minkowski uzayın tarihçesi ve bu uzayla alakalı bazı çalışmalar belirtilmiştir. Bazı özel eğrilerin tanımları, regle yüzeyler ve regle yüzeylerin bazı özellikleri verilmiştir. Son bölümde, üç boyutlu Minkowski uzayında spacelike ve timelike açılabilir olmayan regle yüzeylerin striksiyon çizgileri ele alınmıştır. Özel bir durumda eğrilik ve burulma fonksiyonları hesap edilmiştir. Elde edilen eğrilikler vasıtasıyla bazı özel eğriler arasında bağıntılar kurulmuştur. Böylece, bazı özel hallerde striksiyon çizgisi bazı özel eğriler olarak karşılık bulmuştur. In this thesis, history of Lorentz-Minkowski space and some of the studies related to this space have been indicated. Definitions of some special curves, the ruled surfaces and some properties of ruled surfaces have been given. In the last section, non-developable spacelike and timelike ruled surfaces were handled in three dimensional Minkowski space. The curvature and torsion functions were calculated in a special case. The relationships between some special curves via the obtained curvatures were established. Thus, the line of striction has been found to correspond as some special curves in some particular cases. 47
- Published
- 2019
37. Öklid uzayında sabit oranlı eğri çiftleri
- Author
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Öztürk, Serkan, Erdoğdu, Melek, Danışman: 20436, NEÜ, Fen Bilimleri Enstitüsü, Matematik Anabilim Dalı, and Matematik Anabilim Dalı
- Subjects
N-sabit eğri ,Matematik ,T - constant curve ,İnvolüt - Evolüt eğrileri ,Bertnard eğrileri ,T- sabit eğri ,Constant - ratio curve ,Bertrand curves ,Involute - Evolute curves ,Euclidean space ,Sabit oranlı eğri ,Öklid uzayı ,N- constant curve ,Mathematics - Abstract
Bu tezde; Öklid uzayında sabit oran eğrileri ile ilgili daha önce yapılan çalışmalardan bahsedilmiştir. Öklid uzayında eğrilere ilişkin temel bilgiler, birim hızlı ve birim hızlı olmayan eğriler için Frenet formülleri ifade edilmiştir. Öklid uzayındaki sabit oranlı eğriler, T – sabit eğriler ve N – sabit eğriler tanıtılmıştır. Son olarak; sabit oranlı Bertrand ve İnvolüt – Evolüt eğri çiftlerine dair elde edilen yeni sonuçlar verilmiştir., In this thesis; the previous studies about constant ratio curves in Euclidean space have been mentioned. The fundamental imformations about curves in Euclidean space, Frenet formulas for unit speed and arbitrary speed curves are stated. Constant ratio curves, T – constant and N – constant curves are introduced. Finally; new obtained results on constant ratio Bertrand and Involute – Evolute curve couples are given.
- Published
- 2018
38. Bertrand curves and geometric applications in four dimensional Euclidean space
- Author
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Irmak, Yasemin, Gök, İsmail, and Matematik Anabilim Dalı
- Subjects
Matematik ,Bertrand curves ,Euclidean spaces ,Mathematics - Abstract
Bu tez 6 bölümden oluşmaktadır. İlk bölüm giriş kısmına ayrılmıştır.İkinci bölümde, tezde kullanılan bazı temel tanım ve teoremler verilmiştir.Üçüncü bölümde, ilk olarak n≥4 boyutlu Öklid uzaylarında klasik anlamda Bertrand eğrisi olmadığı ifade edilmiştir. Daha sonra, (1,3)-Bertrand Eğrileri olarak adlandırılan eğriler karakterizasyonları ile birlikte verilmiştir.Dördündü bölümde, 4-boyutlu Öklid uzayında kuaterniyonik Bertrand eğrileri tanımlanmış ve uzaysal kuaterniyonik Bertrand eğrileri ile ilişkileri incelenmiştir. Daha sonra, bitorsiyonu sıfırdan farklı kuaterniyonik (N-B_2) Bertrand eğrileri tanımlanmış ve karakterizasyonları verilmiştir. Beşinci bölümde, 3-boyutlu küre üzerindeki Bertrand eğrilerinin karakterizasyonları verilmiş ve örnekler sunulmuştur. Ayrıca bu eğriler ile (1,3)-Bertrand eğriler arasındaki ilişkiler verilmiştir.Son bölüm tartışma ve sonuç kısmına ayrılmıştır. This thesis consists of six chapter.The first chapter is devoted to the introduction.In the second chapter, some main definitions and theorems which are used in the thesis are given.In the third chapter, firstly we express that there is no Bertrand curve in a classical manner in Euclidean n space for n≥4. Then, curves called (1,3)-Bertrand curves are given together with their characterizations.In the forth chapter, quaternionic Bertrand curve in 4-dimensional Euclidean space are introduced and some relationships with spatial quaternionic Bertrand curves are examined. Then, quaternionic (N-B_2) Bertrand curves with nonzero bitorsion are defined and some characterizations are given.In the fifth chapter, characterizations of Bertrand curves on 3-dimensional sphere are given and some examples are presented. Furthermore, relationships between these curves and (1,3)-Bertrand curves are given.The last chapter is devoted to the discussion and conclusion. 81
- Published
- 2018
39. Regle yüzeylerin karakterizasyonları
- Author
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Aksar, Murat, Yaylı, Yusuf, and Matematik Anabilim Dalı
- Subjects
Matematik ,Bertrand curves ,Helix ,Striction curve ,Curvature ,Darboux function ,Minimal surfaces ,Regle surfaces ,Mathematics - Abstract
Bu tez toplam dört bölümden oluşmaktadır.Birinci bölüm giriş kısmı için ayrılmıştır.İkinci bölümde, ilerdeki bölümler için gerekli olan kavramlar ve tanımlara yer verilmiştir.Üçüncü bölümde, Öklid uzayında regle yüzeylerin temel özellikleri geniş şekilde ele alınmıştır.Son bölüm ise `Structure and Characterization of Ruled Surface in Euclidean 3-Space` makalesinin genişletilmiş haline ayrılmıştır.( Yu, Liu, Jung 2014 )Haziran 2017, 45 sayfaAnahtar Kelimeler: regle yüzeyler, helis, darboux fonksiyonu, eğrilik, Bertrand eğrileri, minimal yüzeyler, boğaz eğrisi This thesis consists of four chapters.The first chapter is placed for the introduction.The second chapter deals with notions and definitions that are necessary for the next chapters. In the third chapter, it is discussed that basic properties of ruled surfaces widely.Last chapter is placed for `Structure and Characterization of Ruled Surface in Euclidean 3-Space` which is extended form in this thesis. ( Yu, Liu, Jung 2014 )June 2017, 45 pagesKey Words: ruled surfaces, helix, darboux function, curvature, striction curve, Bertrand curves, minimal surfaces 56
- Published
- 2017
40. Singular Special Curves in 3-Space Forms.
- Author
-
Huang, Jie and Pei, Donghe
- Subjects
- *
CURVES - Abstract
We study the singular Bertrand curves and Mannheim curves in the 3-dimensional space forms. We introduce the geometrical properties of such special curves. Moreover, we get the relationships between singularities of original curves and torsions of another mate curves. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
41. Minkowski uzayında yönlü eğriler üzerine
- Author
-
Tarım, Gamze, Ekici, Cumali, Dede, Mustafa, Matematik Bilgisayar Anabilim Dalı, and ESOGÜ, Fen Edebiyat Fakültesi, Matematik ve Bilgisayar Bilimleri
- Subjects
Matematik ,Q-çatısı ,Mannheim Eğrileri ,Frenet Çatısı ,Bertrand Curves ,Mannheim Curves ,Minkowski Space ,Minkowski Uzayı ,Bertrand Eğrileri ,Frenet Frame ,Mathematics ,Q-frame - Abstract
Bu tez çalışmasının amacı, Frenet çatısına benzer olan q-çatısı olarak adlandırılan yeni bir çatıyı bir izdüş üm vektörü ile tanımlayarak Minkowski uzayında yönlü eğriler üzerine inceleme yapmaktır. Beş bölümden oluşan çalışmamızda giriş ve literatür araştırması bölümlerinde konunun tarihsel gelişimi hakkında bilgiler aktarılmıştır. Üçüncübölümde çalışmamıza temel oluşturan tanımlar ve teoremler verilmiştir. Dördüncü bölümde Minkowski uzayında bir uzay eğrisinin ve alınan izdüş üm vektörünün timelike veya spacelike olmasına bağlı olarak quasi-normal vektörü yardımıyla q-çatısı tanımlanmıştır. Elde edilen bu q-çatıları için türev denklemleri ve q-eğrilikleri hesaplanmıştır. Son bölümde de ö klidyen ve Minkowski 3-uzaylarında değişik çatılar kullanılarak verilmiş eğri çiftleri ile ilgili özelliklerden yararlanılarak, Minkowski 3-uzayında q-çatısı ve q-eğrilikleri yardımıyla bir uzay eğrisinin timelike veya spacelike olma durumuna göre Bertrand, Mannheim ve involüt-evolüt eğri çiftleri ile ilgili bazı özellikler incelenmiştir. The aim of this thesis is to define a new frame called q-frame, which is similar to Frenet frame, by a projection vector and investigate on directional curves in Minkowski space. The study consists of five chapters. In introduction and literature search chapters, some information about historical development of the subject is given. In the third chapter, basic definitions and theorems that are necessary for the study are given. In the forth chapter a q-frame is defined by the quasi-normal vector, depending on a space curve and projection vector in Minkowski space is timelike or spacelike. The derivative equations and q-curvatures are calculated for the obtained frame. In the final part, in Minkowski 3-space, by the help of q-frame and q-curvatures, depending on a space curve is timelike or spacelike, some properties for Bertrand, Mannheim and involute-evolute curve couples are investigated by using some properties that are given for curve couples by using different frames in Euclidean and Minkowski 3-spaces.
- Published
- 2016
42. 3-boyutlu Öklid uzayında yönlü bertrand eğrileri
- Author
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Lutfu, Şirin, Dede, Mustafa, and Matematik Ana Bilim Dalı
- Subjects
Matematik ,Bertrand curves ,Euclidean spaces ,Euclidean ,Mathematics - Abstract
Bu çalışmada, ilk olarak Öklid uzayı ve Frenet çatısı kavramlarını tanımladık. İkinci olarak bir uzay eğrisi boyunca birden çok çatı tanımlanabileceğini gösterdik, bu yeni tanımladığımız çatıya da q-çatı adını verdik. Üçüncü olarak q-çatı ile Frenet çatısı arasındaki bağlantıları elde ettik. Q-çatının eğriliklerini eğrilik ve torsion kullanarak ifade ettik. Dördüncü olarak iyi bilinen Bertrand eğrilerini q-çatı ile tanımladık. Burada en önemli sonuç olarak tüm eğrilerin yönlü Bertrand eğrisi tanımlanabileceğini elde ettik. Ayrıca Bertrand ve yönlü Bertrand eğrilerini şekiller çizdirerek karşılaştırdık. In this work, first of all we gave detailed information about Euclid space and Frenet frame. Secondly, we showed that we can define more than one frame along a space curve, we called this new frame as q-frame. Then we obtained the relationship between q-frame and Frenet frame. We calculated the new curvatures of the space curve in term of Frenet curvatures. Finally we introduced the well-known concept bertrand curves generated by q-frame. The main result of this study is that every space curve can admit infinite Bertrand mate. Moreover we compared the directional Bertrand mated with Bertrand mates by plotting the figures. 60
- Published
- 2016
43. Bazı özel eğrilerin Sabban çatısına göre Smarandache eğrileri
- Author
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Altun, Yasin, Şenyurt, Süleyman, and Matematik Anabilim Dalı
- Subjects
Matematik ,Bertrand curves ,Involute-evolute curves ,Euclidean spaces ,Mathematics - Abstract
Bu çalışma altı bölüm halinde düzenlenmiştir. Giriş Bölümünde çalışmanın amacı ve konunun ele alınma nedeni tartışıldı. Önceki Çalışmalar Bölümünde Smarandache eğrileri ile ilgili çalışmalara yer verildi. Materyal ve Yöntem Bölümünde Öklid uzayı, involüt-evolüt eğrileri, Bertrand eğri çifti, Mannheim eğri çifti, küresel Frenet formülleri ve Smarandache eğrileri ile ilgili temel kavramlar anlatıldı. Bulgular Bölümü çalışmamızın orjinal kısmını oluşturmaktadır. Burada, bazı özel eğrilerin; involüt-evolüt eğrileri, Bertrand eğri çifti, Mannheim eğri çifti, Frenet vektörleri ile birim Darboux vektörlerinin birim küre yüzeyi üzerinde çizdikleri küresel eğrilere ait Sabban çatıları, küresel Frenet formülleri ve geodezik eğrilikleri hesaplandı. Daha sonra bu eğrilere ait Sabban çatıları konum vektörü olarak alındığında bu vektörlerin çizdiği Smarandache eğrilerinin tanımı verilerek geodezik eğrilikleri bulundu. Son olarak herbir eğri için bulunan sonuçlar, evolüt eğrisi, Bertrand eğrisi ve Mannheim eğrisine bağlı ifadeleri verildi. Konuyla ilgili örnekler bulunup Mapple programıyla çizimleri yapıldı. This study was organized into six sections. In the introduction chapter, the purpose of study and the reasons why this subject is interested were discussed. The next chapter is covered with literature review of Smarandache curve. The basic concepts of Euclidian space, involute-evolute curves, Bertrand partner curve, Mannheim partner curve, spherical Frenet formulae and Smarandache curves were given in the material and method chapter. The findings chapter are the original part of our study. In this chapter, we initially calculated Sabban frames, spherical Frenet formulae and geodesic curvature which drawn on the surface of the sphere by the Frenet frame and unit Darboux vector of some special curves, involute curve, Bertrand partner curve, Mannheim partner curve. Subsequently, when the Sabban frames were belongs to these curves as the position vector, the geodesic curvatures were calculated by giving the definition of Smarandache curves drawn by these vectors. Finally, the results for each curve was given depend on evolute curves, Bertrand curves and Mannheim curves. Several examples related to the subject were found and their drawings were done with Mapple program. 230
- Published
- 2016
44. An application of Ritt-Wu’s zero decomposition algorithm to the pseudo null Bertrand type curves in Minkowski 3-space
- Author
-
Mehmet Yildirim, Kazım İlarslan, and Kırıkkale Üniversitesi
- Subjects
Minkowski space ,pseudo-null curve ,Null (mathematics) ,Zero (complex analysis) ,Space (mathematics) ,Mechanical theorem proving ,Bertrand curves ,mechanical theorem proving ,Computer Science (miscellaneous) ,Decomposition (computer science) ,Ritt-Wu's method ,Algorithm ,Type curve ,Information Systems ,Mathematics - Abstract
WOS: 000289530200014 The Bertrand curves were first studied using a computer by Wu (1987). The same problem was studied using an improved version of Ritt-Wu's decomposition algorithm by Chou and Gao (1993). This paper investigates the same problem for pseudo null Bertrand curves in Minkowski 3-space E1(3.)
- Published
- 2011
45. On the Cartan Curvatures of a Null Curve in Minkowski Spacetime
- Author
-
Çöken, A. Ceylan and Çiftçi, Ünver
- Published
- 2005
- Full Text
- View/download PDF
46. GENERALIZED NULL BERTRAND CURVES IN MINKOWSKI SPACE-TIME
- Author
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İsmail Gök, Ferdağ Kahraman Aksoyak, Kazim Ilarslan, and Kırıkkale Üniversitesi
- Subjects
Pure mathematics ,General Relativity and Quantum Cosmology ,Bertrand curves ,Frenet vectors ,General Mathematics ,Minkowski space ,Null (mathematics) ,null curve ,Minkowski space-time ,Mathematics - Abstract
Çöken and ÇIFTCI proved that a null Cartan curve in Minkowski space-time E41 is a null Bertrand curve if and only if k2 is nonzero constant and k3 is zero. That is, the null curve with non-zero curvature k2 is not a Bertrand curve in Minkowski space-time E41. So, in this paper we defined a new type of Bertrand curve in Minkowski space-time E41 for a null curve with non-zero curvature k3 by using the similar idea of generalized Bertrand curve given by Matsuda and Yorozu and we called it a null (1, 3)-Bertrand curve. Also, we proved that if a null curve with non-zero curvatures in Minkowski space-time E41 is a null (1, 3)-Bertrand curve then it is a null helix. We give an example of such curves.
- Published
- 2014
47. Sabit eğimli yüzeyler ve uygulamaları
- Author
-
Babaarslan, Murat, Yaylı, Yusuf, and Matematik Anabilim Dalı
- Subjects
Matematik ,Bertrand curves ,Spherical indicators ,Quaternions ,Mathematics - Abstract
Yedi bölümden oluşan doktora tezinin birinci bölümünde; konunun tarihi gelişimi ifade edildi. İkinci bölümünde; Öklid 3-uzayında ve Minkowski 3-uzayında eğrilerin ve yüzeylerin, kuaterniyonların ve split kuaterniyonların temel tanım ve teoremleri verildi. Üçüncü bölümde; Öklid 3-uzayında, S2 Öklid 2-küresi üzerindeki birim hızlı eğriler için Sabban çatısı ve küresel evolüt kavramları verildi. S2 Öklid 2-küresi üzerindeki birim hızlı eğrilerden Bertrand eğrilerinin oluşturulabileceği gösterildi. Bertrand eğrileriyle helisler arasındaki bir bağlantı verildi. Bertrand eğrilerinin Darboux göstergelerinin küresel evolütlere eşit olduğu ispatlandı. Ayrıca bir uzay eğrisinin teğetler, asli normaller, binormaller ve Darboux göstergeleri için sabit eğimli yüzeylerin parametrizasyonları bulundu ve bazı sonuçlar elde edildi. Sabit eğimli yüzeylerin v-parametre eğrilerine karşılık gelen Bertrand eğrileri araştırıldı. Dördüncü bölümde; Minkowski 3-uzayında, S21 de Sitter 2-uzayındaki birim hızlı space-like eğriler için Lorentz anlamında Sabban çatısı, de Sitter evolüt kavramları tanımlandı ve bu eğrilerin invaryantları araştırıldı. Daha sonra üçüncü bölümde elde edilen sonuçlar burada incelendi. Beşinci bölümde; dördüncü bölümdeki sonuçlar H2 pseudo-hiperbolik uzayındaki birim hızlı space-like eğriler için araştırıldı. Altıncı bölümde; Öklid 3-uzayında kuaterniyonlar ile sabit eğimli yüzeylerin bağlantıları verildi. Benzer şekilde, yedinci bölümde; Minkowski 3-uzayında split kuaterniyonlar ile space-like sabit eğimli yüzeylerin bağlantıları araştırıldı.Anahtar Kelimeler: Bertrand eğrileri, helisler, küresel evolütler, küresel göstergeler, Sabban çatısı, Öklid 3-uzayı, Minkowski 3-uzayı, kuaterniyonlar, sabit eğimli yüzeyler In the first chapter of the thesis consisting of seven chapters; the historical background of subject is expressed. In the second chapter; fundamental definitions and theorems related to curves and surfaces in Euclidean 3-space and Minkowski 3-space, quaternions and split quaternions are given. In the third chapter; the concepts of Sabban frame, spherical evolute for unit speed curves on Euclidean 2-sphere S2 in Euclidean 3-space are given. It is shown that Bertrand curves can be constructed from unit speed curves on Euclidean 2-sphere S2. A relation between Bertrand curves and helices is given. It is proved that the Darboux indicatrices of Bertrand curves are equal to spherical evolutes. Furthermore, the parametrizations of constant slope surfaces for the tangent, principal normal, binormal and Darboux indicatrices of a space curve are found and some results are obtained. Bertrand curves corresponding to v-parameter curves of constant slope surfaces are investigated. In the fourth chapter; the concepts of Lorentzian Sabban frame, de Sitter evolute for unit speed space-like curves on de Sitter 2-space S21 in Minkowski 3-space are defined and the invariants of these curves are studied. Afterwards, the results which are obtained in the third chapter are investigated here. In the fifth chapter; the results of fourth chapter are studied for unit speed space-like curves on pseudo-hyperbolic space H2. In the sixth chapter; the relations between quaternions and constant slope surfaces are given in Euclidean 3-space. Similarly, in the seventh chapter; the relations between split quaternions and space-like constant slope surfaces are studied in Minkowski 3-space.Key Words: Bertrand curves, helices, spherical evolutes, spherical indicatrices, Sabban frame, Euclidean 3-space, Minkowski 3-space, quaternions, constant slope surfaces 78
- Published
- 2013
48. Bazı manifoldlar üzerinde özel eğriler
- Author
-
Okuyucu, Osman Zeki, Ekmekci, Faik Nejat, and Matematik Anabilim Dalı
- Subjects
Matematik ,Bertrand curves ,Lie groups ,Lie algebras ,Mathematics - Abstract
Bu tez üç bölümden oluşmaktadır.Birinci bölüm giriş kısmına ayrılmıştır.İkinci bölümde, Öklid uzayında eğrilerin temel özelikleri, 3-boyutlu Öklid uzayında bazı özel eğrilerin tanımları ve temel karakterizasyonları, Lie grubu ve Lie cebiri ile ilgili temel kavramlar verilmiştir.Üçüncü bölümde, bi-invaryant metrik ile 3-boyutlu Lie gruplarında genel helislerden bahsedilmiş ve sonrasında slant helisler, Mannheim eğrileri ve Bertrand eğrileri ile ilgili elde edilen kavramlar verilmiştir. This thesis consists of three chapters.The first chapter is devoted to the introduction.In the second chapter, general properties of a curve in Euclidean space, definations and fundamental characterizations of some special curves in Euclidean 3-space, basic concepts about Lie group and Lie algebra have been given.In the third chapter, we mention general helices in three dimensional Lie groups with a bi-invariant metric and then we introduce slant helices, Mannheim curves and Bertrand curves in Lie groups. 71
- Published
- 2013
49. Helices, Bertrand curves and ruled surfaces
- Author
-
Flôres, Marcia Viaro, Pansonato, Claudia Candida, Binotto, Rosane Rossato, and Aiolfi, Arì João
- Subjects
Helices ,Bertrand Curves ,Hélices ,Superfícies regradas ,Curvas de Bertrand ,Ruled surfaces ,CIENCIAS EXATAS E DA TERRA::MATEMATICA [CNPQ] - Abstract
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior This work is designed to study helices and Bertrand curves. A circular helix is characterized by having constant curvature k 6= 0 and constant torsion t . If the ratio t k is constant, the curve is called generalized helix. A curve g : I −→R3 is called a Bertrand curve if there is another curve g : I −→R3 such that the normal lines of g and g at s ∈ I are equal. Generalized helices and Bertrand curves can be viewed as generalizations of the circular helix. In this work, we obtain important characterizations of these curves. Besides, we also study these curves from the view point of the theory of curves on ruled surfaces. O presente trabalho destina-se a um estudo sobre hélices e curvas de Bertrand. Uma hélice circular é caracterizada por ter curvatura k 6= 0 e torção t constantes. Se a razão t k for constante, a curva é chamada hélice generalizada. Uma curva g : I −→ R3 é chamada curva de Bertrand se existe uma outra curva g : I −→ R3 tal que as retas normais de g e g em s ∈ I são iguais. Tanto a hélice generalizada como a curva de Bertrand podem ser vistas como generalizações da hélice circular. Neste trabalho, além de obtermos importantes caracterizações destas curvas, realizamos também um estudo destas do ponto de vista da teoria de curvas em superfícies regradas.
- Published
- 2012
50. Semi-Riemannian uzaylarında bazı özel eğrilerin geometrisi
- Author
-
Göçmen, Mehmet, Keleş, Sadık, and Matematik Anabilim Dalı
- Subjects
Matematik ,Bertrand curves ,Null curves ,Spherical curves ,Involute-evolute curves ,Mathematics - Abstract
Bu çalışma dört bölümden oluşmuştur. Birinci bölüm temel kavramlara ayrılmıştır. İkinci bölümde R^4-1 uzayında yeni bir Bertrand eğrisi tanımı yapıldıktan sonra bu tanıma bağlı kalınarak Minkowski-4 uzayındaki null bir eğrinin hangi şartlar altında bir Bertrand eğrisi olduğu araştırıldı.Daha sonra R^5-1 uzayındaki null küresel eğriler eğrilik fonksiyonları yardımıyla karakterize edildi. Bu bölümde son olarak R^3-1 ve R^4-1 uzaylarındaki Bertrand eğrilerinin açık bir şekilde sınıflandırılması yapıldı.Üçüncü bölümde, ikinci bölümdeki Bertrand eğrisi fikri tekrar kullanılarak R^4-1 uzayındaki bir spacelike eğrinin (2-dejenere eğri) hangi şartlar altında bir Bertrand eğrisi olduğu incelendi.Son bölümde iki indeksli ve düşük boyutlu pseudo-Öklid uzaylarındaki null Bertrand eğrileri ve n-boyutlu ve iki indeksli pseudo-Öklid uzaylarındaki null küresel eğriler incelendi. Ayrıca R^6-2 uzayındaki null bir eğrinin evalütü ve spacelike bir eğrinin involütü tanımlanıp, düzlemsel bir eğri için evalüt ve involüt kavramları arasındaki ilişkinin bu eğriler içinde geçerli olduğu görüldü. This work consists of four chapters. In the first chapter, the basic concepts of differential geometry relating to the subjects in the main chapters of this thesis areintroduced.In the second chapter, a new idea of Bertrand curves is presented. Abiding by this idea the conditions are investigated for a null curve to be a Bertrand curve. After that, null spherical curves in R^5-1 are characterized by their curvature functions. Finally in this chapter, we obtained a classification of Bertrand curves in R^3-1 and R^4-1.In the third chapter, by using the same notion of Bertrand curve in the second chapter, we established the conditions for a spacelike curve in R^4-1 so that it would be a Bertrand curve.In the last chapter, null Bertrand curves in a low dimensional pseudo-Euclidean space of index two and null spherical curves in R^n-2 are determined. After defining the evolute of a null curve and the involute of a spacelike curve in R^6-2, a correspondence between them which is similar to that between the plane evolute and the involute is shown. 74
- Published
- 2012
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