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D.6.10.9 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
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