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Date: Tue, 17 Oct 2006 11:17:03 +0330
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in R-module category  congugate of aR- module as same as opposit of this
R-module
but i dont see general definition of conjugation of a category
conjugatify of an r-module is dulify of r-module
(this example exist in homologybook of sunders maclane)

darush.aghababayeedehkordi