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

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<Verb>EquivariantChainMap(R,S,f):: FreeResolution, FreeResolution, GroupHomomorphisms --> EquiChainMap</Verb>
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<P/> 
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Inputs a free <M>\mathbb ZG</M>-resolution <M>R</M> of <M>\mathbb Z</M>,
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a free <M>\mathbb ZQ</M>-resolution <M>S</M> of <M>\mathbb Z</M>, and
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a group homomorphism <M>f\colon G \rightarrow Q</M>. It returns the induced
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<M>f</M>-equivariant chain map <M>F\colon R \rightarrow S</M>.
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