On *-modules generating the injectives
On projective and injective objects of the categories dual to .
On pure semi-simple Grothendieck categories I
On superfluous subsemimodules.
On the Axiomatizability of Certain Classes of Modules.
On the characterization of Jonsson-Tarski and of subtractive varieties
On the object-wise tensor product of functors to modules.
On weak -homotopy equivalences of modules
Si definisce il gruppo di —omotopia di un singolo modulo e si introduce la nozione di equivalenza -omotopica debole. Sotto determinate condizioni per l'anello di base oppure per i moduli considerati, le equivalenze -omotopiche deboli coincidono con le equivalenze -omotopiche (forti).
Permutation modules and projective resolutions.
Projective abelian Hopf algebras over a field [Book]
Projective covers and minimal free resolutions.
Projective objects in the category of chain complexes
Projektive geordnete Moduln und n-fache Erweiterungen geordneter Moduln.
Pseudohereditary and pseudocohereditary preradicals
Self--injective abelian groups
Serre functors for Lie algebras and superalgebras
We propose a new realization, using Harish-Chandra bimodules, of the Serre functor for the BGG category associated to a semi-simple complex finite dimensional Lie algebra. We further show that our realization carries over to classical Lie superalgebras in many cases. Along the way we prove that category and its parabolic generalizations for classical Lie superalgebras are categories with full projective functors. As an application we prove that in many cases the endomorphism algebra of the basic...
Stable and costable preradicals
Sur les -injectifs
Sur les modules linéairement compacts
Symmetric Hochschild extension algebras
By an extension algebra of a finite-dimensional K-algebra A we mean a Hochschild extension algebra of A by the dual A-bimodule . We study the problem of when extension algebras of a K-algebra A are symmetric. (1) For an algebra A= KQ/I with an arbitrary finite quiver Q, we show a sufficient condition in terms of a 2-cocycle for an extension algebra to be symmetric. (2) Let L be a finite extension field of K. By using a given 2-cocycle of the K-algebra L, we construct a 2-cocycle of the K-algebra...