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7.5.20.0. ndcond
Procedure from library nctools.lib (see nctools_lib).
- Usage:
- ndcond();
- Return:
- ideal
- Purpose:
- compute the non-degeneracy conditions of the basering
- Note:
- if
printlevel > 0, the procedure displays intermediate information (by default, printlevel=0 )
Example:
| | LIB "nctools.lib";
ring r = (0,q1,q2),(x,y,z),dp;
matrix C[3][3];
C[1,2]=q2; C[1,3]=q1; C[2,3]=1;
matrix D[3][3];
D[1,2]=x; D[1,3]=z;
def S = nc_algebra(C,D); setring S;
S;
==> // coefficients: QQ(q1, q2)
==> // number of vars : 3
==> // block 1 : ordering dp
==> // : names x y z
==> // block 2 : ordering C
==> // noncommutative relations:
==> // yx=(q2)*x*y+x
==> // zx=(q1)*x*z+z
ideal j=ndcond(); // the silent version
j;
==> j[1]=(-q2+1)*y*z-z
printlevel=1;
ideal i=ndcond(); // the verbose version
==> Processing degree : 1
==> 1 . 2 . 3 .
==> failed: (-q2+1)*y*z-z
==> done
i;
==> i[1]=(-q2+1)*y*z-z
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