function

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function

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

Signature

function: % $\to$ (R $\to$ R)

$\begin{params} $\sigma$\ & \% & An automorphism of $R$\\ \end{params}$

$\begin{retval} Returns the map corresponding to the action of $\sigma$\ on the ring. \end{retval}$

Manuel Bronstein 2000-12-13