Purity and almost strict purity of Anderson t-modules

Abstract

We study the relations between the notion of purity of a t-module introduced by Anderson and that of almost strict purity for a t-module introduced by Namoijam and Papanikolas (concept already mentioned by G.Anderson and D.Goss).

arXiv comment5 pages, 2 figures. This is a correction to the previous version following an error noticed by Andreas Maurischat