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D.6.14.8 posweight

Procedure from library spcurve.lib (see spcurve_lib).

Usage:
posweight(M,t1,n[,s]); M matrix, t1 module, n int, s string
n=0 : all deformations of non-negative weight
n=1 : only non-constant deformations of non-negative weight
n=2 : all deformations of positive weight

Assume:
M is a presentation matrix of a Cohen-Macaulay codimension 2 ideal and t1 is its T1 space in matrix notation

Return:
new ring containing a list posw, consisting of a presentation matrix describing the deformation given by the generators of T1 of non-negative/positive weight and the weight vector for the new variables

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

Example:
 


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