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7.7.9.0. isVar
Procedure from library freegb.lib (see freegb_lib).

Usage:
isVar(p); poly p

Return:
int

Purpose:
check, whether leading monomial of p is a power of a single variable
from the basering. Returns the exponent or 0 if p is multivariate.

Example:
 
LIB "freegb.lib";
ring r = 0,(x,y),dp;
poly f = xy+1;
isVar(f);
==> 0
poly g = y^3;
isVar(g);
==> 3
poly h = 7*x^3;
isVar(h);
==> 3
poly i = 1;
isVar(i);
==> 0