Hopf Link

$\begin{figure}\begin{center}\BoxedEPSF{Hopf_Link.epsf}\end{center}\end{figure}$

$\begin{displaymath} V(t)=-t-t^{-1} \end{displaymath}$

$\begin{displaymath} P(z,\alpha)=z^{-1}(\alpha^{-1}-\alpha^{-3})+z\alpha^{-1}. \end{displaymath}$

It has Braid Word ${\sigma_1}^2$ .