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<
p>HAP is
a homological
algebra library for use with the
GAP computer algebra system, and is still under development.
The current version <
a
href=
"https://github.com/gap-packages/hap/releases/download/v1.70/hap-1.70.tar.gz">hap1.
70.tar.gz</
a> was released on
19 July
2025.</
p>
<
p>
The initial focus of the library was on computations related to the cohomology of finite and inf
inite groups, with particular emphasis on integral coefficients. The focus has since broadened to include Steenrod algebras of finite groups, Bredon homology, cohomology of simplicial groups, and general computations in algebraic topology relating to finite CW-complexes, covering spaces, knots, knotted surfaces, and topics such as persitent homology arising in topological data analysis.
This tutorial <a href="../SideLinks/About/aboutContents.html" target="_top">table of contents</a> gives an indication of topics covered. This <a href="https://global.oup.com/academic/product/an-invitation-to-computational-homotopy-9780198832980" target="_top">book</a> provides a detailed overview.</p>
<p> A list of some papers which refer to HAP can be found <a href="hap.pdf">here</a>.
<p> <a href="../copyright/copyrightIndex.html" target="_top"> <small>GPL
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