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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 infinite 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.
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