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 May 28th, 2014, 01:05 PM #1 Senior Member     Joined: Apr 2014 From: zagreb, croatia Posts: 234 Thanks: 33 Math Focus: philosophy/found of math, metamath, logic, set/category/order/number theory, algebra, topology Homological Algebra For any abelian group A and for $Z_m$(c) the cyclic group of order m and generator c there is a 1-1 correspondence f: $Ext_z$($Z_m$(c), A) -> $\frac{A}{mA}$, where mA is the subgroup of A consisting of all ma for a € A. Can someone prove this please?

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