Quasi-abelian categories are abundant in functional analysis and representation theory. It is
known that a quasi-abelian category E is a cotilting torsionfree class of an abelian category …

In this paper, we present new concepts of Ann-categories, Ann-functors, and a transmission
of the structure of categories based on Ann-equivalences. We build Ann-category of Pic …

By using the correspondence between locally finitely presented additive categories and
rings with enough idempotents, we study several properties of such rings in terms of the …

We demonstrate equivalence between two definitions of lower finite highest weight
categories. We also show that, in the presence of a duality, a lower finite highest weight …

Let A be an abelian category. We prove that if A admits a generator M with End A (M) right
artinian, then A admits a projective generator. If A is further assumed to be Grothendieck …

Ideals and Clots in Pointed Regular Categories Page 1 Ideals and Clots in Pointed Regular
Categories G. Janelidze & L. Márki & A. Ursini Received: 15 November 2007 /Accepted: 3 …

We introduce subclasses of exact categories in terms of admissible intersections or
admissible sums or both at the same time. These categories are recently studied by Br\" …

In the context of semi-abelian categories, we develop some new xaspects of the categorical
theory of central extensions by Janelidze and Kelly. If C is a semi-abelian category and X is …