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D.12.8.1 isuni

Procedure from library rootsur.lib (see rootsur_lib).

Usage:
isuni(p); poly p;

Return:
poly: if p is a univariate polynomial, it returns the variable. If not, zero.

Example:
 
LIB "rootsur.lib";
ring r = 0,(x,y),dp;
poly p = 6x7-3x2+2x-15/7;
isuni(p);
==> x
isuni(p*y);
==> 0
See also: whichvariable.