DUAL OF CONTRSION THEORIES

In this paper we introduce the notion of Co envelopes, CoCovers and Tor-generators as dual of envelopes, covers and generators in cotorsion (Ext-torsion) theory and deduce that each R-module has cotorsion coprecover.

کلیدواژه ها:

Tor-torsion theory ، Co(pre)cover ، Co(pre)envelope ، Tor-generator