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

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<Section><Heading>Chain Complex</Heading>
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 Given a polyhedron, the face lattice defines a chain complex. This
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 can be done using the following function.
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<ManSection>
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  <Meth Name="ChainComplexFromPolygon" 
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        Arg="poly"/>
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   <Returns>  A <Ref Fam="HapChainComplex" BookName="hap"></Ref></Returns>
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   <Description>
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     Given a polyhedron <A>poly</A> as generated by <Package>polymaking</Package>
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     (see <Ref Meth="CreatePolymakeObjectFromFile"
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     BookName="polymaking"></Ref>), this method generates the face
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     complex.
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   </Description>
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</ManSection>
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</Section>
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