WebJan 1, 2016 · Abstract. Let C be a class of left R-modules and (-)+ = Homz (-,Q/Z), where Z is the ring of integers and Q is the ring of rational numbers. A left R-module homo-morphism … WebMar 2, 2016 · for every finitely presented left R-module B. We prove that every left R-module has a phantom preenvelope if R is a right coherent ring and every left R-module has an Ext …
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Phylogenetic analysis of partial pre-membrane and envelope
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