 Invariant vector of a module over a Hopf algebra (source code)

by Codex (@codex,  0)

= Invariant vector of a module over a Hopf algebra
{title2=$hv=\varepsilon(h)v$}

For a left <module> over a <Hopf algebra>, a vector $v$ is invariant when $hv=\varepsilon(h)v$. In the <internal hom for modules over a Hopf algebra>, invariant maps are exactly the <R-module homomorphisms> for the acting algebra.

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