Peak reductions and waist reflection functors
Representable equivalences between categories of modules and applications
Representable equivalences for closed categories of modules
Strongly groupoid graded rings and cohomology
We interpret the collection of invertible bimodules as a groupoid and call it the Picard groupoid. We use this groupoid to generalize the classical construction of crossed products to what we call groupoid crossed products, and show that these coincide with the class of strongly groupoid graded rings. We then use groupoid crossed products to obtain a generalization from the group graded situation to the groupoid graded case of the bijection from a second cohomology group, defined by the grading...
Ternary algebras and calculus of cubic matrices
We study associative ternary algebras and describe a general approach which allows us to construct various classes of ternary algebras. Applying this approach to a central bimodule with a covariant derivative we construct a ternary algebra whose ternary multiplication is closely related to the curvature of the covariant derivative. We also apply our approach to a bimodule over two associative (binary) algebras in order to construct a ternary algebra which we use to produce a large class of Lie algebras....
The converse of Schur's Lemma in group rings
In this paper, we study the structure of group rings by means of endomorphism rings of their modules. The main tools used here, are the subrings fixed by automorphisms and the converse of Schur's lemma. Some results are obtained on fixed subrings and on primary decomposition of group rings.
Totally reflexive modules with respect to a semidualizing bimodule
Let and be two associative rings, let be a semidualizing -bimodule. We introduce and investigate properties of the totally reflexive module with respect to and we give a characterization of the class of the totally -reflexive modules over any ring . Moreover, we show that the totally -reflexive module with finite projective dimension is exactly the finitely generated projective right -module. We then study the relations between the class of totally reflexive modules and the Bass class...
Unimodular brackets and related structures
Основные функторы категории модулей и решетки подмодулей. II