|  |  D.6.3.3 corank Procedure from libraryclassify.lib(see  classify_lib).
 
Example:Usage:
corank(f); f=poly
Return:
the corank of the Hessian matrix of f, of type int
Remark:
corank(f) is the number of variables occurring in the residual
singularity after applying 'morsesplit' to f
 |  | LIB "classify.lib";
ring r=0,(x,y,z),ds;
poly f=(x2+3y-2z)^2+xyz-(x-y3+x2*z3)^3;
corank(f);
==> 2
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