D.5.1.3 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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&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; User manual for <a href="http://www.singular.uni-kl.de/"><i>Singular</i></a> version 2-0-4, October 2002,
generated by <a href="http://www.gnu.org/software/texinfo/"><i>texi2html</i></a>.
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