Some Auslander-Rieten sequences of Ã-modules are characterized, where à is a triangular
matrix algebra of the form КМ [KM] 0 These sequences may be indicated explicitly by using …

An artin algebra A is said to be equivalent to an algebra A'modulo preprojectives up to the
level n if the categories mod A/add pn (A) and mod A1/add~(A'I are equivalent, Necessary …

The notion of the preprojective partition for an artin algebra was introduced by Auslander
and Smala in 1980 ([6]) and studied by several authors since then. The problems raised …

Let A be an artin algebra, mod A the category of all finitely generated right A-modules, and
ind A the full subcategory of mod A consisting of the indecomposables. Auslander and …

Let A be an artin algebra and let us consider its category of finitely generated, left modules,
mod A. In this paper it is studied, for some classes of artin algebras, the full subcategory P< …

Let 11s wcall that ali algebra. I is equivalent to a liewtlitary algel~ ra A'niotllllo~ xeprojrrti~. r:,
1111 to t, he lt.~. el 11 if tllv catrgories mod A (1 dil-pz (21) Our results in [W2] gave some …

Let A be an artin algebra, mod A the category of all finitely generated right A-modules, and
ind A the full subcategory of mod A consisting of the indccomposablcs. Auslander and …