It is proved that every surjective or injective endo-morphism of a finitely presented left
module over a right perfect ring is an isomorphism. We will adopt the following conventions …

QUASI-INJECTIVE AND PSEUDO-INFECTIVE MODULES Page 1 Canad. Math. Bull. Vol. 18
(3), 1975 QUASI-INJECTIVE AND PSEUDO-INFECTIVE MODULES BY SK JAIN AND SURJEET …

INJECTIVE ENDOMORPHISMS OF FINITELY GENERATED MODULES 900 Page 1 INJECTIVE
ENDOMORPHISMS OF FINITELY GENERATED MODULES WOLMER V. VASCONCELOS1 …

EPIMORPHISMS OF MODULES WHICH MUST BE ISOMORPHISMS Page 1 Canad. Math.
Bull. Vol. 16 (4), 1973 EPIMORPHISMS OF MODULES WHICH MUST BE ISOMORPHISMS BY …

Rosenberg and Zelinsky [6] first addressed the question of characterizing for a ring R those
simple modules RT having injective hulls of finite length. In that work they also announced a …

Introduction* The concept of the" injective envelope" of a module was first given by Eckmann
and Schopf [2], although this terminology was first employed by Matlis [5]. The injective …

IYTRODCCTION 1: n~ onorphism rings of various types of modules have been objects of
extensive study in the recent past [2, 11, 14, 15, 18, 25, 261. In [15] Erika Mares introduced …

One of the fundamental problems on endomorphism rings is to find necessary and sufficient
conditions that an abstract ring be isomorphic to the endomorphism ring of a given type of …

Throughout this paper we suppose that all rings and modules are unitary. By J we denote
always the Jacobson radical of a ring S. The left (right, resp.) annihilator of X is denoted by Z …

1. It has been shown by Feller and Swokowski [I] that if R is an integral domain which has a
right and left quotient ring, then the endomorphism ring E (M) of a finitely generated torsion …