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Almost split sequences of Verma modules

✍ Scribed by R. Farnsteiner; G. Röhrle


Publisher
Springer
Year
2002
Tongue
English
Weight
320 KB
Volume
322
Category
Article
ISSN
0025-5831

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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