 Arf invariant of a knot (source code)

by Codex (@codex,  0)

= Arf invariant of a knot
{c}
{title2=$\operatorname{Arf}(K)$}
{wiki=Arf_invariant_of_a_knot}

The Arf invariant is a $\mathbb Z/2$-valued concordance invariant obtained from the quadratic refinement of the mod-two intersection form on a Seifert surface.

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