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Displaying 921 – 940 of 3959

Ext-algebras and derived equivalences

Dag Madsen (2006)

Colloquium Mathematicae

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

Gabriella D'Este (1986)

Rendiconti del Seminario Matematico della Università di Padova

Extending Derivations and Endomorphisms to Skew Polynomial Rings

Michael G. Voskoglou (1986)

Publications de l'Institut Mathématique

Extending Group Modules in a Relatively Prime Case.

Everett C. Dade (1984)

Mathematische Zeitschrift

Extending modules relative to a torsion theory

Semra Doğruöz (2008)

Czechoslovak Mathematical Journal

An $R$ -module $M$ is said to be an extending module if every closed submodule of $M$ is a direct summand. In this paper we introduce and investigate the concept of a type 2 $τ$ -extending module, where $τ$ is a hereditary torsion theory on $Mod$ - $R$ . An $R$ -module $M$ is called type 2 $τ$ -extending if every type 2 $τ$ -closed submodule of $M$ is a direct summand of $M$ . If $τ_{I}$ is the torsion theory on $Mod$ - $R$ corresponding to an idempotent ideal $I$ of $R$ and $M$ is a type 2 $τ_{I}$ -extending $R$ -module, then the question of whether or not $M / M I$ is...

Extension d'un théorème de Pólya-Cantor à des séries rationnelles en variables non commutatives

Khira Lamèche (1970/1971)

Séminaire Delange-Pisot-Poitou. Théorie des nombres

Extension functors on the category of $A$ -solvable abelian groups

Ulrich F. Albrecht (1991)

Czechoslovak Mathematical Journal

Extension-closure and attainability for varieties of algebras with involution

Barry J. Gardner (1980)

Commentationes Mathematicae Universitatis Carolinae

Extensionless modules over tame hereditary algebras

Frank Okoh (1997)

Colloquium Mathematicae

Extensions galoisiennes d'un corps local à groupes d'inertie cycliques.

Anne-Marie BERGE (1976/1977)

Seminaire de Théorie des Nombres de Bordeaux

Extensions of abelian by hyper-(cyclic or finite) groups (II)

Z. Y. Duan (1993)

Rendiconti del Seminario Matematico della Università di Padova

Extensions of Chain Rings.

Günter Törner, Hans-Heinrich Brungs (1984)

Mathematische Zeitschrift

Extensions of $G M$ -rings

Huanyin Chen, Miaosen Chen (2005)

Czechoslovak Mathematical Journal

It is shown that a ring $R$ is a $G M$ -ring if and only if there exists a complete orthogonal set ${e_{1}, \dots, e_{n}}$ of idempotents such that all $e_{i} R e_{i}$ are $G M$ -rings. We also investigate $G M$ -rings for Morita contexts, module extensions and power series rings.

Extensions of hereditary algebras.

Nikolaos Marmaridis (1984)

Manuscripta mathematica

Extensions of nilpotent blocks.

Lluis Puig, Burkhard Külshammer (1990)

Inventiones mathematicae

Extensions of rational modules.

Cuadra, J. (2003)

International Journal of Mathematics and Mathematical Sciences

Extensions of semimodules and the Takahashi functor ${Ext}_{Λ} (C, A)$ .

Patchkoria, Alex (2003)

Homology, Homotopy and Applications

Extremal properties for concealed-canonical algebras

Michael Barot, Dirk Kussin, Helmut Lenzing (2013)

Colloquium Mathematicae

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

Seok-Zun Song, Kwon-Ryong Park (2008)

Czechoslovak Mathematical Journal

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.

$f$ -derivations on rings and modules

Paul E. Bland (2006)

Commentationes Mathematicae Universitatis Carolinae

If $τ$ is a hereditary torsion theory on ${𝐌𝐨𝐝}_{R}$ and $Q_{τ} : {𝐌𝐨𝐝}_{R} \to {𝐌𝐨𝐝}_{R}$ is the localization functor, then we show that every $f$ -derivation $d : M \to N$ has a unique extension to an $f_{τ}$ -derivation $d_{τ} : Q_{τ} (M) \to Q_{τ} (N)$ when $τ$ is a differential torsion theory on ${𝐌𝐨𝐝}_{R}$ . Dually, it is shown that if $τ$ is cohereditary and $C_{τ} : {𝐌𝐨𝐝}_{R} \to {𝐌𝐨𝐝}_{R}$ is the colocalization functor, then every $f$ -derivation $d : M \to N$ can be lifted uniquely to an $f_{τ}$ -derivation $d_{τ} : C_{τ} (M) \to C_{τ} (N)$ .

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