Top
Back: classify
Forward: Hcode
FastBack:
FastForward:
Up: classify_lib
Top: Singular Manual
Contents: Table of Contents
Index: Index
About: About this document

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


Top Back: classify Forward: Hcode FastBack: FastForward: Up: classify_lib Top: Singular Manual Contents: Table of Contents Index: Index About: About this document
            User manual for Singular version 4.4.0, 2024, generated by texi2html.