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).

Keywords

• Purity
• almost strict purity
• Anderson t-modules
• $t$-motive
• Newton polygons