|  |  D.12.5.1 ecart Procedure from libraryteachstd.lib(see  teachstd_lib).
 
Example:Usage:
ecart(f); f poly or vector
Return:
the ecart e of f of type int
 |  | 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
 | 
 
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