A question about extension.

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1 total messages Started by Leif Johansson Wed, 27 Jan 1993 13:38

#198

Author: Leif Johansson
Date: Wed, 27 Jan 1993 13:38

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Consider the following:

	0->A->E->B->0
        0->A'->E'->B'->0
        0->E->U->E'->0

are three extensions of abelian groups. Is there a way
to express U as a higher ext of something. Are higher
ext's involved in any way ? Any comments and/or hints
would be nice. For various reasons I believe that there
should be an ext^3(something,other) here.

Thank you all in advance.
Leif Johansson
Dept of math. University of Stockholm
leifj@matematik.su.se

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