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D.6.6.9 ContactMatrix

Procedure from library curvepar.lib (see curvepar_lib).

Usage:
ContactMatrix(I); I ideal

Assume:
i is the defining ideal of a (reducible) plane curve singularity.

Return:
intmat N of the contact matrix of the braches of the curve.

Example:
 
LIB "curvepar.lib";
ring r=0,(x,y),ds;
ideal i=x14-x4y7-y11;
ContactMatrix(i);
==> 0,1,1,1,1,
==> 1,0,1,1,1,
==> 1,1,0,1,1,
==> 1,1,1,0,1,
==> 1,1,1,1,0