D.6.1.28 secondary_not_cohen_macaulay
.....................................
Procedure from library finvar.lib (see finvar_lib).

Usage:
secondary_not_cohen_macaulay(P,G1,G2,...[,v]);

P: a 1xn <matrix> with primary invariants, G1,G2,...: nxn <matrices>
generating a finite matrix group, v: an optional <int>

Assume:
n is the number of variables of the basering

Return:
secondary invariants of the invariant ring (type <matrix>)

Display:
information if v does not equal 0

Theory:
Secondary invariants are generated following "Generating Invariant
Rings of Finite Groups over Arbitrary Fields" by Kemper (1996).

Example:
LIB "finvar.lib";
ring R=2,(x,y,z),dp;
matrix A[3][3]=0,1,0,-1,0,0,0,0,-1;
list L=primary_invariants(A);
matrix S=secondary_not_cohen_macaulay(L[1],A);
print(S);
==> 1

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&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; User manual for <a href="http://www.singular.uni-kl.de/"><i>Singular</i></a> version 2-0-4, October 2002,
generated by <a href="http://www.gnu.org/software/texinfo/"><i>texi2html</i></a>.
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