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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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