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D.6.14.4 semiCMcod2

Procedure from library spcurve.lib (see spcurve_lib).

Usage:
semiCMcod2(M,t1[,s]); M matrix, t1 module, s any

Assume:
M is a presentation matrix of an ideal i, CM of codimension 2, and t1 is a presentation of the space of first order deformations of i ((M,t1) as returned by the procedure matrixT1)

Return:
new ring in which the ideal semi describing the semiuniversal deformation of i;
if the optional third argument is given, the perturbation matrix of the semiuniversal deformation is returned instead of the ideal.

Note:
The current basering should not contain any variables named A(j) where j is some integer!

Example:
 


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