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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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#(C) Graham Ellis, 2012


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InstallOtherMethod(Homology,"Integral homology of cat-1-groups",
[IsHapCatOneGroup, IsInt],
function(C,n)
local N,K;

N:=NerveOfCatOneGroup(QuasiIsomorph(C),n+1);
K:=ChainComplexOfSimplicialGroup(N);
return Homology(K,n);

end );
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