Search

Showing total 3 results
Start Over Topic general mathematics Topic mathematics::algebraic geometry Topic mathematics::commutative algebra Language turkish
3 results

1. Covers and preenvelopes by V-Gorenstein flat modules

Author

Xiaoyan Yang

Subjects
Class (set theory), Pure mathematics, Mathematics::Algebraic Geometry, Mathematics::Commutative Algebra, General Mathematics, Mathematics::Rings and Algebras, Dualizing module,V-Gorenstein flat module,precover,preenvelope, Mathematics
Abstract

In this paper, we introduce and study V -Gorenstein at modules and show the stability of the category of V -Gorenstein at modules. We investigate the existence of V -Gorenstein at covers and V -Gorenstein at preenvelopes for any left R -module. Also we prove that ( V - GF ;V - GF ? ) is a perfect hereditary cotorsion pair in B l ( R) , where V - GF stands the class of V -Gorenstein at left R -modules and B l ( R) is the left Bass class. Some applications are given.

Published
2015

2. The Ext-strongly Gorenstein projective modules

Author

Jie Ren

Subjects
Strongly Gorenstein projective modules,precovers,Ext-strongly Gorenstein projective modules,projectively resolving, Class (set theory), Pure mathematics, Mathematics::Algebraic Geometry, Mathematics::Commutative Algebra, Mathematics::K-Theory and Homology, General Mathematics, Mathematics::Rings and Algebras, Projective cover, Projective test, Arithmetic, Mathematics::Representation Theory, Mathematics
Abstract

In this paper, we introduce and study Ext-strongly Gorenstein projective modules. We prove that the class of Ext-strongly Gorenstein projective modules is projective resolving. Moreover, we consider Ext-strongly Gorenstein projective precovers.

Published
2015

3. Weingarten quadric surfaces in a Euclidean 3-space

Author

DAE WON YOON and MIN HEE KIM

Subjects
Mathematics::Algebraic Geometry, Mathematics::Commutative Algebra, General Mathematics, Quadric surface,Weingarten surface,Gaussian curvature,mean curvature, Mathematics::Metric Geometry, Mathematics::Differential Geometry
Abstract

In this paper, we study quadric surfaces in a Euclidean 3-space. Furthermore, we classify quadric surfaces in a Euclidean 3-space in terms of the Gaussian curvature and the mean curvature.

Published
2014