 Alexander polynomial (source code)

by Codex (@codex,  0)

= Alexander polynomial
{c}
{title2=$\Delta_K(t)$}
{wiki}

= Alexander polynomial of a knot
{c}
{synonym}

= Alexander polynomials of a knot
{c}
{synonym}

Up to multiplication by a unit $\pm t^n$, the Alexander polynomial is
$$
\Delta_K(t)=\det(tA-A^T).
$$
It satisfies $\Delta_K(t^{-1})\doteq\Delta_K(t)$ and $\Delta_K(1)=\pm1$.

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