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D.5.4.4 gamma
Procedure from library gaussman.lib (see gaussman_lib).
- Usage:
- gamma(vfiltration(f,0)); poly f
- Assume:
- basering has local ordering, f has isolated singularity at 0
- Return:
- number g: C. Hertling's gamma invariant
Example:
| LIB "gaussman.lib";
ring R=0,(x,y),ds;
poly f=x5+x2y2+y5;
gamma(vfiltration(f,0));
==> 1/240
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