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Browsing by Author "Büyükaşık, Engin"
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Absolutely s-pure modules and neat-flat modules
Büyükaşık, Engin; Durğun, Yılmaz (Taylor & Francis, 2015-02)Let R be a ring with an identity element. We prove that R is right Kasch if and only if injective hull of every simple right R-modules is neat-flat if and only if every absolutely pure right R-module is neat-flat. A ... -
Co-coatomically supplemented modules
Güngör, Serpil (Izmir Institute of Technology, 2013)The purpose of this study to define co-coatomically supplemented modules, -cocoatomically supplemented modules, co-coatomically weak supplemented modules and co-coatomically amply supplemented modules and examine them over ... -
Cofinitely weak supplemented modules
Alizade, Rafail; Büyükaşık, Engin (Taylor & Francis, 2003-11)We prove that a module M is cofinitely weak supplemented or briefly cws (i.e., every submodule N of M with M/N finitely generated, has a weak supplement) if and only if every maximal submodule has a weak supplement. If M ... -
Coneat submodules and coneat-flat modules
Büyükaşık, Engin; Durǧun, Yılmaz (Korean Mathematical Society, 2014)A submodule N of a right R-module M is called coneat if for every simple right R-module S, any homomorphism N → S can be extended to a homomorphism M → S. M is called coneat-flat if the kernel of any epimorphism Y → M → 0 ... -
Extensions of weakly supplemented modules
Alizade, Rafail; Büyükaşık, Engin (Mathematica Scandinavica, 2008)It is shown that weakly supplemented modules need not be closed under extension (i.e. if U and M/U are weakly supplemented then M need not be weakly supplemented). We prove that, if U has a weak supplement in M then M is ... -
Homological objects of proper classes generated by simple modules
Durğun, Yılmaz (Izmir Institute of Technology, 2014)The main purpose of this thesis is to study some classes of modules determined by neat, coneat and s-pure submodules. A right R-module M is called neat-flat (resp. coneat-flat) if the kernel of any epimorphism Y → M → 0 ... -
Injective modules and their generalizations
Demir, Özlem (Izmir Institute of Technology, 2018-07)The main goal of this thesis is to give a survey about some different generalizations of injective modules, namely, C1, C2, C3-conditions and the modules which satisfy the simple versions of these conditions. A right ... -
Modules satisfying conditions that are opposites of absolute purity and flatness
Kafkas Demirci, Gizem (Izmir Institute of Technology, 2017-07)The main purpose of this thesis is to study the properties which are opposites of absolute pure and flat modules. A right module M is said to be test for flatness by subpurity (for short, t.f.b.s.) if its subpurity domain ... -
Modules whose maximal submodules are supplements
Büyükaşık, Engin; Pusat, Dilek (Hacettepe Üniversitesi, 2010)We study modules whose maximal submodules are supplements (direct summands). For a locally projective module, we prove that every maximal submodule is a direct summand if and only if it is semisimple and projective. We ... -
Neat-flat modules
Büyükaşık, Engin; Durğun, Yılmaz (Taylor & Francis, 2016-01)Let R be a ring. A right R-module M is said to be neat-flat if the kernel of any epimorphism Y → M is neat in Y, i.e., the induced map Hom(S, Y) → Hom(S, M) is surjective for any simple right R-module S. Neat-flat right ... -
On a recent generalization of semiperfect rings
Büyükaşık, Engin; Christian, Lomp (Cambridge University Press, 2008-10)In a recent paper by Wang and Ding, it was stated that any ring which is generalized supplemented as a left module over itself is semiperfect. The purpose of this note is to show that Wang and Ding's claim is not true and ... -
On generalization of Hopfian modules
Yaman, Mehmet (Izmir Institute of Technology, 2018-12)The notion of Hopfian modules are defined as a generalization of modules of finite length as the modules whose surjective endomorphisms are isomorphisms. These modules and several generalizations of them are extensively ... -
On pseudo semisimple rings
Mutlu, Hatice (Izmir Institute of Technology, 2013)In this thesis, we give a survey of right pseudo semisimple rings and prove some new results about these rings. Namely, we prove that a right pseudo semisimple ring is an internal exchange ring and a right pseudo semisimple ... -
On pseudo semisimple rings
Büyükaşık, Engin; Mohamed, Saad H.; Mutlu, Hatice (World Scientific Publishing, 2013-03)A necessary and sufficient condition is obtained for a right pseudo semisimple ring to be left pseudo semisimple. It is proved that a right pseudo semisimple ring is an internal exchange ring. It is also proved that a right ... -
On relative projectivity of some classes of modules
Alagöz, Yusuf (Izmir Institute of Technology, 2019-07)The main purpose of this thesis is to study R-projectivity and max-projectivity of some classes of modules, and module classes related to max-projective modules. A right R-module M is called max-projective provided that ... -
On the structure of modules characterized by opposites of injectivity
Altınay, Ferhat (Izmir Institute of Technology, 2018-07)In this thesis we consider some problems and also generalize some results related to indigent modules and subinjectivity domains. We prove that subinjectivity domain of any right module is closed under factor modules if ... -
On w-local modules and Rad-supplemented modules
Büyükaşık, Engin; Tribak, Rachid (Korean Mathematical Society, 2014)All modules considered in this note are over associative commutative rings with an identity element. We show that a w-local module M is Rad-supplemented if and only if M/P(M) is a local module, where P(M) is the sum of all ... -
Operations on proper classes related to supplements
Demirci, Yılmaz Mehmet (Izmir Institute of Technology, 2012)The purpose of this study is to understand the properties of the operations +, ◦, and * defined on classes of short exact sequences and apply them to the proper classes related to supplements. The operation ◦ on classes ... -
Poor and pi-poor Abelian groups
Alizade, Rafail; Büyükaşık, Engin (Taylor & Francis, 2017-01)In this paper, poor abelian groups are characterized. It is proved that an abelian group is poor if and only if its torsion part contains a direct summand isomorphic to (Formula presented.) , where P is the set of prime ... -
Rad-supplemented modules
Büyükaşık, Engin; Mermut, Engin; Özdemir, Salahattin (Universita di Padova, 2010)Let τ be a radical for the category of left R-modules for a ring R. If M is a τ-coatomic module, that is, if M has no nonzero τ-torsion factor module, then τ(M) is small in M. If V is a τ-supplement in M, then the intersection ...
