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D.12.5.1 ecart

Procedure from library teachstd.lib (see teachstd_lib).

Usage:
ecart(f); f poly or vector

Return:
the ecart e of f of type int

Example:
 
LIB "teachstd.lib";
ring r=0,(x,y,z),ls;
ecart((y+z+x+xyz)**2);
==> 4
ring s=0,(x,y,z),dp;
ecart((y+z+x+xyz)**2);
==> 0