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 On quasi-exact sequences Bull. Korean Math. Soc. 2005 Vol. 42, No. 1, 149-155 Published online March 1, 2005 S. M. Anvariyeh and B. Davvaz Yazd University, Yazd University Abstract : The notion of $U$-exact sequence (or quasi-exact sequence) of modules was introduced by Davvaz and Parnian-Garamaleky as a generalization of exact sequences. In this paper, we prove further results about quasi-exact sequences. In particular, we give a generalization of Schanuel's Lemma. Also we obtain some relationship between quasi-exact sequences and superfluous (or essential) submodules. Keywords : quasi-exact sequence, superfluous (essential) submodule MSC numbers : 18G99, 13C99 Downloads: Full-text PDF