| #### D.12.7.2 whichvariable Procedure from library `rootsur.lib` (see rootsur_lib). Usage: whichvariable(p); poly p Return: poly: if p is a univariate monomial, the variable. Otherwise 0. Assume: p is a monomial Example:
    LIB "rootsur.lib";
    ring r = 0,(x,y),dp;
    whichvariable(x5);
    ==> x
    whichvariable(x3y);
    ==> 0
See also: isuni.

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