Relations between endomorphism rings, injectivity, surjectivity and uniserial modules


ALTUN ÖZARSLAN M. , Facchini A.

JOURNAL OF ALGEBRA AND ITS APPLICATIONS, vol.19, no.4, 2020 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 19 Issue: 4
  • Publication Date: 2020
  • Doi Number: 10.1142/s0219498820500759
  • Title of Journal : JOURNAL OF ALGEBRA AND ITS APPLICATIONS

Abstract

For a right module M-R over a ring R, we consider the set I of all the endomorphisms phi is an element of E := End(M-R) that are not injective and the set K of all the endomorphisms phi that are not surjective. We prove that. when M-R is a uniserial module, then E/K is a left chain domain and E/I is a right chain domain. The technique we make use of to prove this can be applied to arbitrary modules M-R, not-necessarily uniserial. When the endomorphisms phi are not in I (not in K), then left (right) divisibility in E corresponds to inclusion in the lattice L(M-R) of all submodules of M-R. This allows to study factorizations of injective (surjective, respectively) endomorphisms of M-R analyzing finite chains in the partially ordered set L(M-R).