3,563 results on '"Closed set"'
Search Results
2. Lattice of $E$-closed Classes of Multifunctions of Rank 2
- Author
-
B. P. Ilyin and V.I. Panteleev
- Subjects
closure ,equality predicate ,multifunction ,closed set ,composition ,Mathematics ,QA1-939 - Abstract
Multifunctions are discrete functions defined on a finite set and returning as their values all subsets of the considered set. The paper considers the classification of multifunctions defined on a two-element set with respect to the E-closure operator. E-closed sets of multifunctions are sets that are closed under superposition, the closure operator with branching by the equality predicate, the identification of variables, and the addition of dummy variables. The concept of separating sets was introduced using a greedy algorithm for the set covering problem, and 22 classes of separating sets were obtained. It is shown that the classification under consideration leads to a finite set of closed classes. The work describes all 359 E-closed classes of multifunctions, among which there are 138 pairs of dual classes and 83 self-dual classes. For each class consisting only of multifunctions, its generating system is indicated.
- Published
- 2024
- Full Text
- View/download PDF
3. Some nil-ai-semiring varieties.
- Author
-
Wu, Y. N. and Zhao, X. Z.
- Subjects
- *
VOCABULARY - Abstract
We study some nil-ai-semiring varieties. We establish a model for the free object in the variety FC generated by all commutative flat semirings. Also, we provide two sufficient conditions under which a finite ai-semiring is nonfinitely based. As a consequence, we show that the power semiring P S ˙ c (W) of the finite nil-semigroup S ˙ c (W) is nonfinitely based, where W is a finite set of words in the free commutative semigroup X c + over an alphabet X, whenever the maximum of lengths of words in W is k ≥ 3 and W does not contain the kth power of a letter. This partially answers a problem raised by Jackson et al. (J Algebr 611: 211–245, 2022). [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
4. Criterion of Completeness and Submaximal Ultraclones for Linear Hyperfunctions of Rank 2
- Author
-
I.K. Sharankhaev
- Subjects
hyperfunction ,linear function ,closed set ,ultraclone ,lattice ,Mathematics ,QA1-939 - Abstract
In recent years, the direction associated with the study of maps from a finite set A to the set of all subsets of the set A, including the empty one, has been intensively developing. Such mappings are called multifunctions on A, as well as hyperfunctions on A, if an empty subset is excluded from the subsets under consideration. It is not difficult to see that the so-called undefined or undefined functions, which are studied in many works, are most directly related to this field of research. The power of the set A is called the rank of multifunction or hyperfunction. Obviously, multifunctions and hyperfunctions generalize well-known functions of k-valued logic, however, it should be noted that the usual superposition of functions of k-valued logic is not suitable for multifunctions and hyperfunctions. Two types of superpositions are most often considered here, one of them leads to sets closed relative to the superposition, which are called multiclones and hyperclones, and for the second type of superposition, closed sets are called ultraclones and partial ultraclones. In this article, the elements of the rank 2 ultraclone lattice are considered. By now, all the maximum and minimum elements of this lattice are known. For example, Panteleev V.I. described all maximal ultraclones in the predicate language, which allowed us to prove the completeness criterion of an arbitrary system of hyperfunctions of rank 2. We managed to prove the completeness criterion in the maximal ultraclone of linear hyperfunctions of rank 2. Thus, all submaximal ultraclones of linear hyperfunctions are described.
- Published
- 2023
- Full Text
- View/download PDF
5. Some Results In Neutrosophic Soft Metric Spaces
- Author
-
M. Jeyaraman, J. Johnsy, and R. Pandiselvi
- Subjects
metric spaces ,soft set ,open ball ,closed set ,neutrosophic soft metric space ,Mathematics ,QA1-939 ,Electronic computers. Computer science ,QA75.5-76.95 - Abstract
In this research, we define a novel concept termed neutrosophic soft metric space as well as in vestigate its fundamental characteristics. Additionally, in neutrosophic soft metric spaces, we present various topological features of this newly developed space, such as the soft open sphere and the soft closed sphere. The neutrosophic soft metric space has already been studied in depth, and its topological as well as structural features have been mapped out.
- Published
- 2023
- Full Text
- View/download PDF
6. SOME RESULTS IN NEUTROSOPHIC SOFT METRIC SPACES.
- Author
-
Jeyaraman, M., Johnsy, J., and Pandiselvi, R.
- Subjects
- *
METRIC spaces , *OPEN spaces , *SOFT sets , *SPHERES - Abstract
In this research, we define a novel concept termed neutrosophic soft metric space as well as investigate its fundamental characteristics. Additionally, in neutrosophic soft metric spaces, we present various topological features of this newly developed space, such as the soft open sphere and the soft closed sphere. The neutrosophic soft metric space has already been studied in depth, and its topological as well as structural features have been mapped out. [ABSTRACT FROM AUTHOR]
- Published
- 2023
7. Some new results on ⋆-metric spaces.
- Author
-
Das, Abhishikta and Bag, Tarapada
- Subjects
- *
CAUCHY sequences , *AXIOMS , *TRIANGLES , *DIAMETER - Abstract
The concept of ⋆-metric, based on the relaxation of triangle inequality of metric axioms by using a t-definer, was introduced by Khatami and Mirzavaziri. This paper extends and generalizes some well-known results of classical metric space. Considering the definition of ⋆-metric space, it studies the notion of a closed ball. The paper proves some results related to closed sets, convergent sequences, Cauchy sequences, and the diameter of a set. This paper contains the study on the metrizability of ⋆-metric space and provides an alternative approach to the proof of metrizability for ⋆-metric space using the famous 'Niemytski and Wilson's metrization theorem'. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
8. A statistical approach to aid examiners in the forensic analysis of handwriting.
- Author
-
Crawford, Amy M., Ommen, Danica M., and Carriquiry, Alicia L.
- Subjects
- *
GRAPHOLOGY , *K-means clustering , *STATISTICAL models , *HANDWRITING , *PROBABILITY theory - Abstract
We develop a statistical approach to model handwriting that accommodates all styles of writing (cursive, print, connected print). The goal is to compute a posterior probability of writership of a questioned document given a closed set of candidate writers. Such probabilistic statements can support examiner conclusions and enable a quantitative forensic evaluation of handwritten documents. Writing is treated as a sequence of disjoint graphical structures, which are extracted using an automated and open‐source process. The graphs are grouped based on the similarity of their shapes through a K‐means clustering template. A person's writing pattern can be characterized by the rate at which graphs are emitted to each cluster. The cluster memberships serve as data for a Bayesian hierarchical model with a mixture component. The rate of mixing between two parameters in the hierarchy indicates writing style. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
9. TOPOLOGY BASED ON NEW GENERALIZED CLOSED SETS.
- Author
-
NETHAJI, OCHANAN and JEYALAKSHMI, PITCHAI
- Subjects
- *
TOPOLOGY , *TOPOLOGICAL spaces - Abstract
In this paper, we introduce a new classes of sets called E-closed sets and Eα-closed sets in topological spaces and we study some of its basic properties. This class lies between the class of closed sets and the class of g-closed sets. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
10. Structural Similarity of Objects Represented by Ordinary Graphs.
- Author
-
Gusakova, S. M.
- Abstract
The operations of structural similarity on the objects with a factual basis presented as ordinary graphs are considered. Conditions are given under which such objects are similar, and a characterization of the set of graphs with isomorphic results of the similarity operation is presented. The proofs use the apparatus of the Galois correspondence associated with the graph. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
11. From Open Set to Closed Set: Supervised Spatial Divide-and-Conquer for Object Counting.
- Author
-
Xiong, Haipeng, Lu, Hao, Liu, Chengxin, Liu, Liang, Shen, Chunhua, and Cao, Zhiguo
- Subjects
- *
MATHEMATICAL analysis , *COUNTING , *ACQUISITION of data - Abstract
Visual counting, a task that aims to estimate the number of objects from an image/video, is an open-set problem by nature as the number of population can vary in [ 0 , + ∞) in theory. However, collected data are limited in reality, which means that only a closed set is observed. Existing methods typically model this task through regression, while they are prone to suffer from unseen scenes with counts out of the scope of the closed set. In fact, counting has an interesting and exclusive property—spatially decomposable. A dense region can always be divided until sub-region counts are within the previously observed closed set. We therefore introduce the idea of spatial divide-and-conquer (S-DC) that transforms open-set counting into a closed set problem. This idea is implemented by a novel Supervised Spatial Divide-and-Conquer Network (SS-DCNet). It can learn from a closed set but generalize to open-set scenarios via S-DC. We provide mathematical analyses and a controlled experiment on synthetic data, demonstrating why closed-set modeling works well. Experiments show that SS-DCNet achieves state-of-the-art performance in crowd counting, vehicle counting and plant counting. SS-DCNet also demonstrates superior transferablity under the cross-dataset setting. Code and models are available at: https://git.io/SS-DCNet. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
12. 'A Study On Generalized Ab Closed Sets In Topological Spaces'.
- Author
-
Vishwakarma, Avinash and Tiwari, Savita
- Abstract
Ideas of defining non-manifold topologies on flat and curved spacetime taking into account the causal structure of spacetime, paved the way for the use of topology in general relativity. The A, f, s, fine, t and space topologies are some of the topologies defined on Makowski space and the path topology, space topology, separating topology, Zeeman topology and geodesic topology are some of the non-manifold topologies defined on Lorentz manifolds with a reasonable homeomorphism group making these topologies physically significant and interesting for their mathematical study. New line In the present paper, it is obtained that the Makowski space with the A-topology is Harsdorf, path connected, separable, non-first countable, non-regular, non-compact and non-simply connected. It is also found that a set is compact in Makowski space with the A-topology if and only if it is compact in the Euclidean space and does not contain the image of a Zeno sequence. The A-topology on the Makowski space has been generalized to Lorentz manifolds and studied its compact sets and topological properties. New line Further, it is obtained that the homeomorphism group of Makowski space with the f-topology is the group generated by Lorentz transformations together with translations and dilatations. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
13. New Generalized Closed Set in Neutrosophic Topological Spaces
- Author
-
Md. Hanif Page, Sujata S. Tallur, and R. Dhavaseelan
- Subjects
closed set ,open set ,neutrosophic topology ,Mathematics ,QA1-939 ,Electronic computers. Computer science ,QA75.5-76.95 - Abstract
The main intention of this paper is to develop the idea of Neutrosophic Semi-generalized pre-closed set in neutrosophic topological space. We also study relations and some properties between the existing Neutrosophic closed set. The examples are provided wherever necessary. Besides, we discuss some applications of Neutrosophic Semi-generalized pre closed set.
- Published
- 2021
- Full Text
- View/download PDF
14. Un depósito votivo excepcional en Contributa Iulia Ugultunia (Medina de las Torres, Badajoz).
- Author
-
Bustamante-Álvarez, Macarena, González Blas, Alejandro, Mateos Cruz, Pedro, and Pizzo, Antonio
- Abstract
Copyright of Spal: Revista de Prehistoria y Arqueologia de la Universidad de Sevilla is the property of Spal. Revista de Prehistoria y Arqueologia de la Universidad de Sevilla 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
- 2022
- Full Text
- View/download PDF
15. A Proof of Fatou’s Interpolation Theorem.
- Author
-
Danielyan, Arthur A.
- Abstract
For Fatou’s interpolation theorem of 1906 we suggest a new elementary proof. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
16. Beta Generalized Closed Sets in Topological Spaces.
- Author
-
Kavitha, V. and Sasikala, V. E.
- Subjects
- *
TOPOLOGICAL spaces , *TOPOLOGY , *SET theory , *MATHEMATICS , *MATHEMATICAL functions - Abstract
The this paper, we introduce a new class of closed sets called Beta generalized closed set in topological spaces is to describe and analyze the basics of the set of closed sets, especially Beta generalized closed set in topological spaces. We also study their properties with few existing examples of closed sets, along with their characterizations. [ABSTRACT FROM AUTHOR]
- Published
- 2022
17. On some problems of instability in semi-dynamical systems
- Author
-
Boris S. Kalitine
- Subjects
semi-dynamical system ,closed set ,instability ,lyapunov function ,Mathematics ,QA1-939 - Abstract
The problem of instability of a closed positively invariant set M of a semi-dynamical system on an arbitrary metric space X is considered. The Lyapunov’s direct method for such problems has been developed quite completely in the case when M is compact and X is locally compact. In this article, we obtain sufficient conditions for instability in terms of Lyapunov functions in two situations: M has a neighborhood of positive Lagrange stable semi-trajectories; the space X is asymptotically compact in some neighborhood of M.
- Published
- 2021
- Full Text
- View/download PDF
18. Regularity of the extensions of a double fuzzy topological space.
- Author
-
Vivek, S. and Mathew, Sunil C.
- Subjects
- *
FUZZY sets , *TOPOLOGICAL spaces , *FUZZY topology - Abstract
This paper studies the regularity of the extensions of a double fuzzy topological space. The interrelations among certain families of closed sets in a double fuzzy topological space and its extensions are also investigated. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
19. Topological properties of closed weakly m-semiconvex sets.
- Author
-
Osipchuk, Tetiana M.
- Subjects
- *
TOPOLOGICAL property , *CONVEX sets , *POINT set theory - Abstract
The present work considers properties of generally convex sets in the n-dimensional real Euclidean space ℝn, n > 1, known as weakly m-semiconvex, m = 1, 2, ... , n − 1. For all that, the subclass of not m-semiconvex sets is distinguished from the class of weakly m-semiconvex sets. A set of the space ℝn is called m-semiconvex if, for any point of the complement of the set to the whole space, there is an m-dimensional half-plane passing through this point and not intersecting the set. An open set of ℝn is called weaklym-semiconvex if, for any point of the boundary of the set, there exists an m-dimensional half-plane passing through this point and not intersecting the given set. A closed set of ℝn is called weaklym-semiconvex if it is approximated from the outside by a family of open weakly m-semiconvex sets. An example of a closed set with three connected components of the subclass of weakly 1-semiconvex but not 1-semiconvex sets in the plane is constructed. It is proved that this number of components is minimal for any closed set of the subclass. An example of a closed set of the subclass with a smooth boundary and four components is constructed. It is proved that this number of components is minimal for any closed, bounded set of the subclass having a smooth boundary and a not 1-semiconvex interior. It is also proved that the interior of a closed, weakly 1-semiconvex set with a finite number of components in the plane is weakly 1-semiconvex. Weakly m-semiconvex but not m-semiconvex domains and closed connected sets in ℝn are constructed for any n ≥ 3 and any m = 1, 2, ... , n − 2. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
20. On closed weakly m-convex sets.
- Author
-
Osipchuk, Tetiana M.
- Subjects
- *
POINT set theory - Abstract
In the present work we study properties of generally convex sets in the n-dimensional real Euclidean space R n, n ą 1, known as weakly mconvex, m = 1, . . ., n ´ 1. An open set of R n is called weakly m-convex if, for any boundary point of the set, there exists an m-dimensional plane passing through this point and not intersecting the given set. A closed set of R n is called weakly m-convex if it is approximated from the outside by a family of open weakly m-convex sets. A point of the complement of a set of R n to the whole space is called an m-nonconvexity point of the set if any m-dimensional plane passing through the point intersects the set. It is proved that any closed, weakly (n ´ 1)-convex set in R n with non-empty set of (n ´ 1)-nonconvexity points consists of not less than three connected components. It is also proved that the interior of a closed, weakly 1-convex set with a finite number of components in the plane is weakly 1-convex. Weakly m-convex domains and closed connected sets in R n with non-empty set of mnonconvexity points are constructed for any n ą 2 and any m = 1, . . ., n´2. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
21. Classification of Multioperations of Rank 2 by E-precomplete Sets
- Author
-
V.I. Panteleev and L.V. Ryabets
- Subjects
closure ,equality predicate ,multioperation ,closed set ,composition ,precomlete set ,Mathematics ,QA1-939 - Abstract
In this paper multioperations defined on a two-element set and their closure operator based on composition operator and the equality predicate branching operator is considered. The composition operator is based on union of sets. The classification of multioperations based on their membership in precomplete sets has been obtained. It is shown that the number of equivalence classes is 129. All types of bases are described and it is proved that the maximum cardinality of a basis is 4.
- Published
- 2020
- Full Text
- View/download PDF
22. Reduction Attributes By Using Pretopological Space Based on Similarity Matrix.
- Author
-
Nasr, Asmaa M., ElGhawalby, Hewayda, and Mareay, R.
- Subjects
INFORMATION storage & retrieval systems - Abstract
Attribute reduction and function selection have end up one of the essential steps for pattern recognition and machine getting to know responsibilities. The purpose of attribute reduction is to discover a minimal attribute subset that satisfies a few particular criteria, even as the minimal attribute subset is referred to as attribute reduce. In this paper a pretopological space in an information system is to be constructed, as well as defining some essential operations for the pretopological space and a brief study of its properties will be presented. Moreover, we use similarity method by using pretopological space' matrix to reduce the attribute. We will compare the pretopologies resulting after the removing of the attributes with the original pretopology resulting from the information system. [ABSTRACT FROM AUTHOR]
- Published
- 2021
23. The Completeness Criterion for Closure Operator with the Equality Predicate Branching on the Set of Multioperations on Two-Element Set
- Author
-
V.I. Panteleev and L. Riabets
- Subjects
closure ,equality predicate ,multioperation ,closed set ,composition ,completeness criterion ,Mathematics ,QA1-939 - Abstract
Multioperations are operations from a finite set A to set of all subsets of A. The usual composition operator leads to a continuum of closed sets. Therefore, the research of closure operators, which contain composition and other operations becomes necessary. In the paper, the closure of multioperations that can be obtained using the operations of adding dummy variables, identifying variables, composition operator, and operator with the equality predicate branching is studied. We obtain eleven precomplete closed classes of multioperations of rank 2 and prove the completeness criterion. The diagram of inclusions for one of the precomplete class is presented.
- Published
- 2019
- Full Text
- View/download PDF
24. Distance Functions Between Sets in (q1, q2)-Quasimetric Spaces.
- Author
-
Greshnov, A. V.
- Subjects
- *
SET functions , *COMPLETENESS theorem , *DISTANCES , *SPACE - Abstract
We prove completeness theorems for the set of all d-closed d-bounded sets in a (q1, q2)-quasimetric space (X, d) equipped with suitable analogs of the Hausdorff distance. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
25. A closed sets based learning classifier for implicit authentication in web browsing.
- Author
-
Dia, Diyé, Kahn, Giacomo, Labernia, Fabien, Loiseau, Yannick, and Raynaud, Olivier
- Subjects
- *
WEB browsing , *IMPLICIT learning , *BEHAVIORAL assessment , *IDENTITY theft , *NEAR field communication , *INFORMATION retrieval , *SOCIAL security numbers - Abstract
Faced with both identity theft and the theft of means of authentication, users of digital services are starting to look rather suspiciously at online systems. To increase access security it is necessary to introduce some new factor of implicit authentication such as user behavior analysis. A behavior is made up of a series of observable actions and taken as a whole, the most frequent of these actions amount to habit. The challenge is to detect identity theft as quickly as possible and, reciprocally, to validate a legitimate identity for as long as possible. To take up this challenge, we introduce in this paper a closed set-based learning classifier. This classifier is inspired by classification in concept lattices from positive and negative examples and several works on emerging patterns. We also rely on the tf-idf parameter used in the context of information retrieval. We propose three heuristics named H t f − i d f c , H s u p c and H s u p M i n c to select closed patterns for each class to be described. To compute performance of our models we have followed an experimental protocol described in a previous study which had the same purpose. Then, we compared the results from our own dataset of web navigation connection logs of 3,000 users over a six-month period with the heuristic H s u p introduced in this study. Moreover, to strengthen our analysis, we have designed and set up one model based on the naive Bayes classifier to be used as a reference statistical tool. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
26. 3a quasi M-θ-ii-continuous functions in bi-Supra topological spaces
- Author
-
Taha H. Jasim
- Subjects
supra topological space ,open set ,closed set ,quasi m ,continuous ,Science - Abstract
In this paper , we introduces a new definition in bi-supra topological space , called M-θ- ii- open and via this definition , we introduce a new types of functions called quasi M-θ-ii-continuous functions which unifies some weak forms of quasi θ-ii-continuous functions in bi-supra topological spaces and investigate their properties.
- Published
- 2017
- Full Text
- View/download PDF
27. On the connectedness of a random closed set of a Euclidean space
- Author
-
Rafael M. Rubio, Jónatan Herrera, and Juan J. Salamanca
- Subjects
Set (abstract data type) ,Discrete mathematics ,Closed set ,Artificial Intelligence ,Logic ,Euclidean space ,Social connectedness ,Abstract simplicial complex ,Characterization (mathematics) ,Topology (chemistry) ,Mathematics - Abstract
Our aim is to obtain a suitable characterization of certain topological properties of a random closed set through its capacity functional. The main technique mixes two different fields: on the one hand, the abstract simplicial complex associated to a covering, whose topology coincides with the topology of the original set thanks to the nerve theorem. On the other hand, the celebrated Choquet-Kendall-Matheron theorem, which states that a random closed set is characterized by its capacity functional.
- Published
- 2022
28. On Classes of Hyperfunctions of Rank 2 Generated by Maximal Multiclones
- Author
-
A.S. Zinchenko and V.I. Panteleyev
- Subjects
hyperclone ,basis ,hyperfunction ,complete set ,superposition ,closed set ,multifunction ,Mathematics ,QA1-939 - Abstract
The research of multifunctions is a one of the directions in discrete function’s investigations. Multifunction is a discrete function from a finite set A to all subsets of A. The set of hyperfunctions is a subset of set of multifunctions. Hyperfunction is a discrete function from a finite set A to all nonempty subsets of A. The subset relation of hyperfunctions to maximal multiclones is a relation of equivalence and according it all hyperfunctions are divided into equivalence classes. Based on this equivalence it is possible to estimate the cardinality of all possible bases, calculate the number of different types of bases of the same cardinality, and construct some intervals of the clone lattice. Knowing the number of maximal clones, we can obtain upper-bound estimate of the number of such classes as the cardinality of the set of all subsets of the set of maximal clones. It possible to lower this estimate by using properties of the hyperfunctions . A lower-bound estimate for the number of classes can be obtained by constructing the corresponding classes. It is noteworthy that the complexity of the problem of describing all equivalence classes increases essentially with the cardinality of the set of maximal clones increasing. This paper considers multifunctions on a two-element set. The number of maximal multiclones equals to 15 (Panteleyev V.I., 2009). The primary purpose of this research is describing the classification of the set of hyperfunctions into equivalence classes. As Kazimirov A.S. and Panteleyev V.I. showed there are 18 equivalence classes on the set of Boolean functions, which is a subset of the set of hyperfunctions. In this paper were obtained special properties of hyperfunctions and were described all the equivalence classes generated by functions of 3 arguments having applied a computer experiment. The obtained results made it possible to show that the subset relation of hyperfunctions to maximal multiclones splits the set of all hyperfunctions into 67 equivalence classes.
- Published
- 2017
- Full Text
- View/download PDF
29. Continuous images of closed sets in generalized Baire spaces
- Author
-
Philipp Schlicht and Philipp Lücke
- Subjects
Regular cardinal ,Closed set ,Statement (logic) ,continuous image ,General Mathematics ,Image (category theory) ,Mathematics::General Topology ,Mathematics - Logic ,regular cardinal ,Combinatorics ,Mathematics::Logic ,closed subset ,03E05, 03E15, 03E35, 03E47 ,direct successor ,FOS: Mathematics ,Uncountable set ,Arithmetic ,Algebra over a field ,dense open subset ,Logic (math.LO) ,Kappa ,Mathematics - Abstract
Let $\kappa$ be an uncountable cardinal with $\kappa=\kappa^{{\kappa^+$'' implies the statement "every closed subset of ${}^\kappa\kappa$ is a continuous image of ${}^\kappa(\kappa^+)$'' or its negation., Comment: 30 pages
- Published
- 2023
30. L(wc)-spaces and Some of its Weak Forms.
- Author
-
Nadhim, Nadia A., Ali, Haider J., and Majeed, Rasha N.
- Subjects
TOPOLOGICAL spaces ,CLOSED loop systems ,NUMERICAL analysis ,MATHEMATICAL analysis ,SET theory - Abstract
Copyright of Journal of Qadisiyah Computer Science & Mathematics is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) 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
- 2019
- Full Text
- View/download PDF
31. A note on I- convergence of filters.
- Author
-
Sharma, Shivani
- Subjects
- *
TOPOLOGICAL spaces , *FILTERS & filtration , *TOPOLOGY - Abstract
In this paper, we make further investigation on I- convergence of filters and introduce I- closed sets in a topological space. We have used I- closed sets to determine topology on an arbitrary set. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
32. Brouwer and cardinalities.
- Author
-
Hart, Klaas Pieter
- Abstract
Abstract This note is a somewhat personal account of a paper that L.E.J. Brouwer published in 1908 and that dealt with the possible cardinalities of subsets of the continuum. That paper is of interest because it represents the first time that Brouwer presented his ideas on foundations in an international forum. I found Brouwer's notions and arguments at times hard to grasp if not occasionally perplexing. I hope that this note contributes to a further discussion of the definitions and reasonings as presented in Brouwer's paper. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
33. On almost everywhere differentiability of the metric projection on closed sets in lp(ℝn), 2 < p < ∞.
- Author
-
Sjödin, Tord
- Abstract
Let F be a closed subset of ℝ
n and let P(x) denote the metric projection (closest point mapping) of x ∈ ℝn onto F in lp -norm. A classical result of Asplund states that P is (Fréchet) differentiable almost everywhere (a.e.) in ℝn in the Euclidean case p = 2. We consider the case 2 < p < ∞ and prove that the ith component Pi (x) of P(x) is differentiable a.e. if Pi (x) 6= xi and satisfies Hölder condition of order 1/(p−1) if Pi (x) = xi . [ABSTRACT FROM AUTHOR]- Published
- 2018
- Full Text
- View/download PDF
34. An Open Set Recognition Method for SAR Targets Based on Multitask Learning
- Author
-
Xiaojie Ma, Sijia Feng, Gangyao Kuang, Boli Xiong, Kefeng Ji, and Linbin Zhang
- Subjects
Synthetic aperture radar ,Closed set ,Computer science ,business.industry ,Open set ,Multi-task learning ,Pattern recognition ,Geotechnical Engineering and Engineering Geology ,Target acquisition ,ComputingMethodologies_PATTERNRECOGNITION ,Automatic target recognition ,Test set ,Classifier (linguistics) ,Artificial intelligence ,Electrical and Electronic Engineering ,business - Abstract
Most of the existing synthetic aperture radar (SAR) automatic target recognition (ATR) methods aim at the closed set situation, in which the classes of targets in the test set have appeared in the training set. However, in practice, the classifier is likely to encounter the targets from unseen categories and classify them incorrectly, which brings a huge challenge to current SAR ATR techniques. To overcome this problem, this letter proposes an open set recognition (OSR) method based on multitask learning, and the method is developed from generative adversarial network (GAN). Essentially, this method decomposes OSR into two tasks: classification and abnormal detection. The classification task is the same as that in the closed set situation, while the abnormal detection task is used to determine whether the targets belongs to the unseen categories. Correspondingly, the network structure of GAN is modified and the other full-connection network branch is added to the end of the discriminator, so it has the ability to accomplish the above two tasks. Finally, according to the results of two tasks, the OSR for SAR targets can be realized. The experimental results on moving and stationary target acquisition (MSTAR) dataset demonstrate that the proposed method has the better recall, precision, F1, and accuracy than other OSR methods.
- Published
- 2022
35. Fixed point properties for semigroups on weak$^{*}$ closed sets of dual Banach spaces
- Author
-
Anthony To-Ming Lau and Yong Zhang
- Subjects
Pure mathematics ,Closed set ,General Mathematics ,Banach space ,Fixed point ,Mathematics ,Dual (category theory) - Published
- 2022
36. Coronavirus Decision-Making Based on a Locally -Generalized Closed Set
- Author
-
M. El Sayed, M. A. El Safty, Yahya Almalki, and S. A. Alblowi
- Subjects
Class (set theory) ,2019-20 coronavirus outbreak ,Theoretical computer science ,Closed set ,Computer science ,Open set ,medicine.disease_cause ,Theoretical Computer Science ,Alpha (programming language) ,Computational Theory and Mathematics ,Artificial Intelligence ,medicine ,Information system ,MATLAB ,computer ,Software ,computer.programming_language ,Coronavirus - Abstract
Real-world applications now deal with a massive amount of data, and information about the world is inaccurate, incomplete, or uncertain. Therefore, we present in our paper a proposed model for solving problems. This model is based on the class of locally generalized closed sets, namely, locally simply* alpha generalized closed* sets and locally simply* alpha generalized closed** sets (briefly, L S-M*alpha GC*-sets and L S-M*alpha GC**-sets), based on simply* alpha open set. We also introduce various concepts of their properties and their relationship with other types, and we are studying several of their properties. Finally, we apply the concept of the simply* alpha open set to illustrate the importance of our method in decision-making for information systems about the infections of Coronavirus in humans. In fact, we were able to decide the impact factors of Coronavirus infection. The results were also programmed using the MATLAB program. Therefore, it is recommended that our proposed concept be used in future decision-making.
- Published
- 2022
37. On Micro-generalized Closed Sets and Micro-generalized Continuity in Micro Topological Spaces
- Author
-
Saja S. Mohsen, Kanayo Stella Eke, and Taha H. Jasim
- Subjects
Statistics and Probability ,Numerical Analysis ,Pure mathematics ,Class (set theory) ,Algebra and Number Theory ,Closed set ,Continuous function ,Applied Mathematics ,Geometry and Topology ,Topological space ,Theoretical Computer Science ,Mathematics - Abstract
The purpose of this paper is to define and study a new class of sets called micro generalized closed sets and define micro generalized continuous function and irresolute micro generalized continuous function in micro topological spaces. Basic properties of micro generalized closed sets and its characterizations are analyzed.
- Published
- 2021
38. On ψgs-closed Sets in Bitopological Spaces
- Author
-
Lezel Mernilo Tutanes
- Subjects
Statistics and Probability ,Set (abstract data type) ,Numerical Analysis ,Pure mathematics ,Algebra and Number Theory ,Closed set ,Applied Mathematics ,Geometry and Topology ,Theoretical Computer Science ,Mathematics - Abstract
In this paper, the properties of ψgs-closed sets in bitopological spaces are investigated. The relationships between ψgs-closed set and other closed sets in bitopological spaces are established and some properties of ψgs-closure and ψgs-interior are provided.
- Published
- 2021
39. Matrix approach to spanning matroids of rough sets and its application to attribute reduction
- Author
-
Lirun Su and Fusheng Yu
- Subjects
Reduction (recursion theory) ,Optimization problem ,Theoretical computer science ,General Computer Science ,Closed set ,Computer science ,Granular computing ,TheoryofComputation_GENERAL ,Equivalence relation ,Rough set ,Mathematical structure ,Matroid ,Theoretical Computer Science - Abstract
Rough set theory is a granular computing tool used to deal with ambiguity and uncertainty in information systems. However, many optimization problems in rough sets, such as attribute reduction, are NP-hard problems, and most of the algorithms for these problems are greedy. As a complex mathematical structure, matroids provide a powerful tool for solving combinatorial optimization problems related to attribute reduction. Therefore, it is necessary to study the combination of matroids and rough sets. This paper uses rough sets and matrix approaches to spanning matroids. Moreover, the features of spanning matroids are applied to attribute reduction in decision information systems. Firstly, we construct spanning sets based on equivalence relations which can induce matroids called spanning matroids. Secondly, some features of spanning matroids, such as closed sets, bases, are studied by matrix method. Finally, the judgment theorems with the features of spanning matroids are proposed for addressing the problems about attribute reduction in decision information systems. Simultaneously, the sufficient and necessary conditions for distinguishing upper approximation reduction in inconsistent decision information systems are obtained from the viewpoint of spanning matroids.
- Published
- 2021
40. On fuzzy monotone convergence Q-cotopological spaces
- Author
-
Qingguo Li, Kai Wang, Zhongxi Zhang, and Fu-Gui Shi
- Subjects
Subcategory ,0209 industrial biotechnology ,Closed set ,Logic ,Quantale ,02 engineering and technology ,Characterization (mathematics) ,Space (mathematics) ,Fuzzy logic ,Combinatorics ,020901 industrial engineering & automation ,Monotone polygon ,Artificial Intelligence ,0202 electrical engineering, electronic engineering, information engineering ,020201 artificial intelligence & image processing ,Commutative property ,Mathematics - Abstract
In this paper, we generalize the concept of a monotone convergence space (also called a d-space) to the setting of a Q -cotopological space, where Q is a commutative and integral quantale. We establish a D-completion for every stratified Q -cotopological space, which is a category reflection of the category S Q -CTop of stratified Q -cotopological spaces onto the full subcategory S Q -DCTop of monotone convergence Q -cotopological spaces. By introducing the notion of a tapered set, a direct characterization of the completion is obtained: the D-completion of each stratified Q -cotopological space X consists exactly of those tapered closed sets in X. We show that the D-completion can be applied to obtain a universal fuzzy directed completion of a Q -ordered set by endowing it with the Scott cotopology, taking the D-completion, and then passing to the specialization Q -order. Consequently, the category Q -DOrd of fuzzy directed complete Q -ordered sets and Scott continuous functions is reflective in the category Q -Ordσ of Q -ordered sets and Scott continuous functions.
- Published
- 2021
41. Properties of Nαg Closed Sets in Topological Spaces
- Author
-
V. Senthilkumaran, M. Dharani, and Y. Palaniappan
- Subjects
Pure mathematics ,Closed set ,Topological space ,Mathematics - Published
- 2021
42. Some Games with Soft -ᶅ-Pre-Generalized Open Sets
- Author
-
Esmaeel R. B and Hammood A. A
- Subjects
Algebra ,Ideal (set theory) ,Closed set ,Computer science ,Open set ,Axiom - Abstract
In this paper, the concept of soft closed groups is presented using the soft ideal pre-generalized open and soft pre-open, which are -ᶅ- - -closed sets " -closed", Which illustrating several characteristics of these groups. We also use some games and - Separation Axiom, such as (Ʈ0, Ӽ, ᶅ) that use many tables and charts to illustrate this. Also, we put some proposals to study the relationship between these games and give some examples.
- Published
- 2021
43. Weak Solutions for Compressible Isentropic Navier–Stokes Equations in Dimensions Three
- Author
-
Xianpeng Hu
- Subjects
Physics ,Closed set ,Mechanical Engineering ,Weak solution ,Mathematical analysis ,Mathematics::Analysis of PDEs ,Zero (complex analysis) ,Momentum ,Mathematics (miscellaneous) ,Compressibility ,Hausdorff measure ,Navier–Stokes equations ,Analysis ,Energy (signal processing) - Abstract
Except a closed set $${\mathfrak {S}}^c$$ with zero parabolic Hausdorff measure, the weak limit $$(\rho ,\mathbf{u})$$ of approximate solutions is a renormalized weak solution with finite energy of three dimensional compressible Navier–Stokes equations for $$\gamma \in (6/5, 3/2]$$ as constructed by Lions and Feireisl et al. in the Leray sense. The key novelty of the paper is the improved integrability of pressure by localization, which is based on the faster decay of the gradient of velocity and the higher integrability of the Riesz potentials of both density and momentum.
- Published
- 2021
44. Some types of separation axioms for (k, m)-generalized fuzzy -(resp., fuzzy )- closed sets in dfts
- Author
-
Shaymaa M. Abdullah, Hana I. Lafta, and Taha H. Jasim
- Subjects
Discrete mathematics ,Closed set ,Applied Mathematics ,Fuzzy logic ,Analysis ,Mathematics ,Separation axiom - Published
- 2021
45. Systematic categorization and evaluation of CbO-based algorithms in FCA
- Author
-
Jan Konecny and Petr Krajča
- Subjects
Information Systems and Management ,Closed set ,Efficient algorithm ,Computer science ,Computation ,05 social sciences ,050301 education ,02 engineering and technology ,Computer Science Applications ,Theoretical Computer Science ,Categorization ,Artificial Intelligence ,Control and Systems Engineering ,0202 electrical engineering, electronic engineering, information engineering ,Enumeration ,Formal concept analysis ,020201 artificial intelligence & image processing ,Polynomial delay ,0503 education ,Algorithm ,Software - Abstract
Algorithms based on Close-by-One (CbO) are polynomial delay algorithms used for the enumeration of closed sets, particularly formal concepts in Formal Concept Analysis. We describe and categorize their distinctive features. We experimentally evaluate the influence of the features on the computation time. We show that via the study of individual features, we can design new and more efficient algorithms.
- Published
- 2021
46. Uncertain XML Functional Dependencies Based on Tree Tuple Models
- Author
-
Lv, Teng, He, Weimin, Yan, Ping, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Bao, Zhifeng, editor, Gao, Yunjun, editor, Gu, Yu, editor, Guo, Longjiang, editor, Li, Yingshu, editor, Lu, Jiaheng, editor, Ren, Zujie, editor, Wang, Chaokun, editor, and Zhang, Xiao, editor
- Published
- 2012
- Full Text
- View/download PDF
47. Un depósito votivo excepcional en Contributa Iulia Ugultunia (Medina de las Torres, Badajoz)
- Author
-
Ministerio de Ciencia, Innovación y Universidades (MICINN). España, Bustamante-Álvarez, Macarena, González Blas, Alejandro, Mateos Cruz, Pedro, Pizzo, Antonio, Ministerio de Ciencia, Innovación y Universidades (MICINN). España, Bustamante-Álvarez, Macarena, González Blas, Alejandro, Mateos Cruz, Pedro, and Pizzo, Antonio
- Abstract
Se presenta un conjunto cerámico excepcional localizado en el yacimiento hispanorromano de Contributa Iulia Ugultunia (Medina de las Torres, Badajoz). Además de un análisis en clave tipocronológica de las piezas, se estudia el contexto espacial en el que se localizó, donde se destaca la presencia de un edificio singular. Este estudio nos ha permitido, por un lado, aportar nuevas precisiones cronotipológicas de la vajilla y otros enseres localizados, gracias a la naturaleza unifásica del vertido. Por otro, se presenta una hipótesis de trabajo relativa al acto convivial que generó la deposición y su relación con las prácticas religiosas de este enclave. Para finalizar, este singular hallazgo se pone en relación con otros conjuntos excepcionales hallados en la misma región geográfica, la Baeturia céltica, lo que nos permite trazar algunos patrones de comportamiento común en este espacio del suroroeste peninsular., An exceptional ceramic ensemble located in the Hispano-Roman site of Contributa Iulia Ugultunia (Medina de las Torres, Badajoz) is presented. In addition to a typochronological analysis of the pieces, the spatial context in which it was located is studied, where the presence of a unique building stands out. This study has allowed us, on the one hand, to provide new chronotypological details of the crockery and other localized items, thanks to the one-phase nature of the spill. On the other, a working hypothesis is presented regarding the convivial act that generated the deposition and its relationship with the religious practices of this settlement. Finally, this singular finding is studied in relation with other exceptional assemblages found in the same geographical region, the Celtic Baeturia, which allows us to trace some common behavior patterns in this area of the south-west of the Iberian peninsula.
- Published
- 2022
48. Un depósito votivo excepcional en Contributa Iulia Ugultunia (Medina de las Torres, Badajoz)
- Author
-
Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Bustamante Álvarez, Macarena, González Blas, Alejandro, Mateos Cruz, Pedro, Pizzo, Antonio, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Bustamante Álvarez, Macarena, González Blas, Alejandro, Mateos Cruz, Pedro, and Pizzo, Antonio
- Abstract
[ES] Se presenta un conjunto cerámico excepcional localizado en el yacimiento hispanorromano de Contributa Iulia Ugultunia (Medina de las Torres, Badajoz). Además de un análisis en clave tipocronológica de las piezas, se estudia el contexto espacial en el que se localizó, donde se destaca la presencia de un edificio singular. Este estudio nos ha permitido, por un lado, aportar nuevas precisiones cronotipológicas de la vajilla y otros enseres localizados, gracias a la naturaleza unifásica del vertido. Por otro, se presenta una hipótesis de trabajo relativa al acto convivial que generó la deposición y su relación con las prácticas religiosas de este enclave. Para finalizar, este singular hallazgo se pone en relación con otros conjuntos excepcionales hallados en la misma región geográfica, la Baeturia céltica, lo que nos permite trazar algunos patrones de comportamiento común en este espacio del suroroeste peninsular., [EN] An exceptional ceramic ensemble located in the Hispano-Roman site of Contributa Iulia Ugultunia (Medina de las Torres, Badajoz) is presented. In addition to a typochronological analysis of the pieces, the spatial context in which it was lo-cated is studied, where the presence of a unique building stands out. This study has allowed us, on the one hand, to provide new chronotypological details of the crockery and other localized items, thanks to the one-phase nature of the spill. On the other, a working hypothesis is presented regarding the convivial act that generated the deposition and its relationship with the religious practices of this settlement. Finally, this singular finding is studied in relation with other exceptional assemblages found in the same geographical region, the Celtic Baeturia, which allows us to trace some common behavior patterns in this area of the south-west of the Iberian peninsula.
- Published
- 2022
49. ¿Una habitación por consenso?: la calle que estamos construyendo en los enclaves residenciales y lo que podemos hacer para recuperarla: el caso de Bogotá.
- Author
-
Bermúdez Obregón, Ramón and Bermúdez Obregón, Ramón
- Abstract
“La calle es una habitación por consenso” (Kahn,1971), donde las edificaciones que la delimitan son las encargadas de otorgarle su propósito y carácter (Monteys, 2017). Esta ponencia parte de esta premisa para proponer una revisión de los elementos urbanos arquetípicos que aún hoy dan forma a la ciudad: la Calle, la esquina, la plaza y la manzana. Nos ocupa estudiarlas pormenorizadamente para entender sus valores y su pervivencia en la ciudad de los enclaves residenciales y buscar alternativas construibles para resolver sus evidentes falencias (Sennett,2018). Esta ponencia apunta establecer las bases del proyecto piloto CIUDAD ISLA, que se ha concentrado en demostrar la viabilidad de introducir arquitecturas consensuales para conformar bordes activos en el espacio público de la ciudad existente aprovechando los espacios libres disponibles. El caso de estudio escogido es Bogotá debido a la magnitud del fenómeno de enclaves residenciales en el tejido urbano. En 2018 la ciudad contaba con 3500 conjuntos cerrados (De la Carrera, 2014) que albergaban al 38% de los hogares urbanos (Kostenwein, 2020), "The street is a room by consensus" (Kahn, 1971), where the buildings that delimit it are in charge of giving it its purpose and character (Monteys, 2017). This presentation starts from this premise to propose a review of the archetypal urban elements that still shape the city today: the Street, the corner, the square and the block. It is up to us to study them in detail to understand their values and their survival in the city of residential enclaves and to look for constructable alternatives to solve their obvious shortcomings (Sennett, 2018). This presentation aims to establish the bases of the CIUDAD ISLA pilot project, which has focused on demonstrating the viability of introducing consensual architectures to form active borders in the public space of the existing city, taking advantage of the available free spaces. The case study chosen is Bogotá due to the magnitude of the phenomenon of residential enclaves in the urban fabric. In 2018 the city had 3,500 closed complexes (De la Carrera, 2014) that housed 38% of urban households (Kostenwein, 2020), Peer Reviewed
- Published
- 2022
50. NANO JD CLOSED SETS
- Author
-
Jackson S and Gnanapoo Denosha T
- Subjects
Computer Science::Emerging Technologies ,Closed set ,Nano ,Topology ,Mathematics - Abstract
Nano JD closed sets, a new class of Nano generalized closed sets in Nano topological spaces, relies on the g-interior and g closure operators. This paper aims to interpret and investigate its extension and connection with other existing concepts.
- Published
- 2021
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.