Generalized projectivity
Hana Jirásková, Josef Jirásko (1978)
Czechoslovak Mathematical Journal
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Hana Jirásková, Josef Jirásko (1978)
Czechoslovak Mathematical Journal
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Al-Thani, Huda Mohammed J. (2002)
International Journal of Mathematics and Mathematical Sciences
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Ladislav Bican (1974)
Czechoslovak Mathematical Journal
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Ibrahim Assem, Dan Zacharia (1999)
Colloquium Mathematicae
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Let R be a split extension of an artin algebra A by a nilpotent bimodule , and let M be an indecomposable non-projective A-module. We show that the almost split sequences ending with M in mod A and mod R coincide if and only if = 0 and .