| #### D.12.8.2 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.

User manual for Singular version 4-0-2, 2015, generated by texi2html.