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D.6.4.3 corank
Procedure from library classify.lib (see classify_lib).
- 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
Example:
| 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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