\begin{definition}[Definition:Alexander Polynomial]
For a knot $K$ with Seifert matrix $V$, the '''Alexander polynomial''' of $K$ is defined as:
:$\map {\Delta_K} t = \map \det {V - t V^\intercal}$
{{NamedforDef|James Waddell Alexander II|cat=Alexander}}
Category:Definitions/Knot Theory
\end{definition}