When Maurits Cornelis Escher started to produce astonishing tesselations of the plane in the late 30

Results concerning chain conditions in rings or, more generally, modules give information about the

We consider the multiplication and differentiation operators x and d/dx, which generate the Weyl alg

Ring epimorphisms are important from a representation-theoretical point of view as they provide a wa

In this talk I will present Galois correspondence between subalgebras of a Hopf Galois extension and

A left R-module M is called morphic if M/im(f) is isomorphic to ker(f), for every endomorphism f of

The depth of a subalgebra B in an algebra A is a number computed by considering tensor powers of mod

We consider rings over which the injective hulls of simple modules are locally Artinian. We will giv

It is easy to check that the sum of any family of two-sided nil ideals of an associative ring is a n

Given a group G grading a k-linear category \mathcal{C}, a Galois covering of \mathcal{C} has been a