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D.6.12.2 ModEqn

Procedure from library qhmoduli.lib (see qhmoduli_lib).

Usage:
ModEqn(f [, opt]); poly f; int opt;

Purpose:
compute equations of the moduli space of semiquasihomogenos hypersurface singularity with principal part f w.r.t. right equivalence

Assume:
f quasihomogeneous polynomial with an isolated singularity at 0

Return:
polynomial ring, possibly a simple extension of the ground field of the basering, containing the ideal 'modid'
- 'modid' is the ideal of the moduli space if opt is even (> 0). otherwise it contains generators of the coordinate ring R of the moduli space (note : Spec(R) is the moduli space)

Options:
1 compute equations of the mod. space,
2 use a primary decomposition,
4 compute E_f0, i.e., the image of G_f0,
to combine options, add their value, default: opt =7

Example:
 


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