Almost Split Sequences for Comodules
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William Chin; Mark Kleiner; Declan Quinn
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Article
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2002
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Elsevier Science
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English
โ 147 KB
Let be a coalgebra over a field k. We introduce an operator Tr that takes a right quasi-finitely copresented -comodule M to a left quasi-finitely copresentedcomodule Tr M. If M is indecomposable not injective and Tr M is finite-dimensional over k, we prove the existence of an almost split sequence 0