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appears?


\begin{usage} appears?(p, i) \end{usage}


Signature


\begin{params} {\em p} & \% & An exterior product\\ {\em i} & \htmlref{\texttt{MachineInteger}}{MachineInteger} & The index of a variable\\\end{params}

\begin{retval} Returns {\it true}\xspace ~if $X_i$\ appears in $p$, {\it false}\xspace ~otherwise. \end{retval}

Manuel Bronstein 2000-12-13