On Degenerations and Extensions of Finit
β
Klaus Bongartz
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Article
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1996
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Elsevier Science
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English
β 996 KB
We derive a cancellation theorem for degenerations of modules that says in particular, that projective or injective common direct summands can always be neglected. Combining the cancellation result with the existence of almost split sequences we characterize the orbit closure of a module living on p