Ext and von Neumann regular rings
Ext-algebras and derived equivalences
Using derived categories, we develop an alternative approach to defining Koszulness for positively graded algebras where the degree zero part is not necessarily semisimple.
Extended strings and admissible words
Extending Derivations and Endomorphisms to Skew Polynomial Rings
Extending Group Modules in a Relatively Prime Case.
Extending modules relative to a torsion theory
An -module is said to be an extending module if every closed submodule of is a direct summand. In this paper we introduce and investigate the concept of a type 2 -extending module, where is a hereditary torsion theory on -. An -module is called type 2 -extending if every type 2 -closed submodule of is a direct summand of . If is the torsion theory on - corresponding to an idempotent ideal of and is a type 2 -extending -module, then the question of whether or not is...
Extension d'un théorème de Pólya-Cantor à des séries rationnelles en variables non commutatives
Extension functors on the category of -solvable abelian groups
Extension-closure and attainability for varieties of algebras with involution
Extensionless modules over tame hereditary algebras
Extensions galoisiennes d'un corps local à groupes d'inertie cycliques.
Extensions of abelian by hyper-(cyclic or finite) groups (II)
Extensions of Chain Rings.
Extensions of -rings
It is shown that a ring is a -ring if and only if there exists a complete orthogonal set of idempotents such that all are -rings. We also investigate -rings for Morita contexts, module extensions and power series rings.
Extensions of hereditary algebras.
Extensions of nilpotent blocks.
Extensions of rational modules.
Extensions of semimodules and the Takahashi functor .
Extremal properties for concealed-canonical algebras
Canonical algebras, introduced by C. M. Ringel in 1984, play an important role in the representation theory of finite-dimensional algebras. They also feature in many other mathematical areas like function theory, 3-manifolds, singularity theory, commutative algebra, algebraic geometry and mathematical physics. We show that canonical algebras are characterized by a number of interesting extremal properties (among concealed-canonical algebras, that is, the endomorphism rings of tilting bundles on...
Extreme preservers of maximal column rank inequalities of matrix sums over semirings
We characterize linear operators that preserve sets of matrix ordered pairs which satisfy extreme properties with respect to maximal column rank inequalities of matrix sums over semirings.