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HOMEWORK #3 – MATH 538 FALL 2013 (1) Suppose that R is a ring and M and M are R-modules. Prove that M ⊕ M is flat if and onl
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DING PROJECTIVE AND DING INJECTIVE DIMENSIONS Chaoling Huang and Tongsuo Wu 1. Introduction Recall that an R-module M is Gorenst
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THE EXISTENCE OF FLAT COVERS flat, then <j> is called a flat cover of M if F' F —^— M F (b) ¡ \ F —^ M
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