MODULES WHICH ARE INVARIANT UNDER AUTOMORPHISMS OF THEIR INJECTIVE HULLS

Author:

LEE TSIU-KWEN1,ZHOU YIQIANG2

Affiliation:

1. Department of Mathematics, National Taiwan University, Taipei 106, Taiwan

2. Department of Mathematics and Statistics, Memorial University of Newfoundland, St. John's, Nl A1C 5S7, Canada

Abstract

A module is defined to be an automorphism-invariant module if it is invariant under automorphisms of its injective hull. Quasi-injective modules and, more generally, pseudo-injective modules are all automorphism-invariant. Here we develop basic properties of these modules, and discuss when an automorphism-invariant module is quasi-injective or injective. Some known results on quasi-injective and pseudo-injective modules are extended.

Publisher

World Scientific Pub Co Pte Lt

Subject

Applied Mathematics,Algebra and Number Theory

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