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negative?


\begin{usage} negative?~t \end{usage}


Signature


\begin{params} {\em t} & \% & An expression tree\\ \end{params}

\begin{retval} Returns {\it true}\xspace ~if either $t$\ is a numerical leaf an... ...he form $(- s)$\ for some tree $s$, {\it false}\xspace ~otherwise. \end{retval}


See Also


Manuel Bronstein 2000-12-13