سال انتشار: ۱۳۸۶

محل انتشار: سی و هشتمین کنفرانس ریاضی ایران

تعداد صفحات: ۳

نویسنده(ها):

M GOLRIZ – Department Of Teacher Education, Tehran South Branch, Islamic Azad University, Tehran, Iran

چکیده:

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.