Jan Trlifaj
Non-perfect rings and a theorem of Eklof and Shelah

Comment.Math.Univ.Carolinae 32,1 (1991) 27-32.

Abstract:We prove a stronger form, $A^+$, of a consistency result, $A$, due to Eklof and Shelah. $A^+$ concerns extension properties of modules over non-left perfect rings. We also show (in ZFC) that $A$ does not hold for left perfect rings.

Keywords: perfect ring, Ext, uniformization
AMS Subject Classification: 16A50, 16A51