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sign


\begin{usage} sign~$\sigma$ \end{usage}


Signature


\begin{params} {\em$\sigma$} & \% & A permutation\\ \end{params}

\begin{retval} Returns the sign of $\sigma$, {\it i.e.}$(-1)^\epsilon$where $\e... ...\ is the number of tranpositions in the factorization of $\sigma$. \end{retval}

Manuel Bronstein 2000-12-13