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D.6.7.8 vfilt

Procedure from library gmssing.lib (see gmssing_lib).

Usage:
vfilt(t); poly t

Assume:
characteristic 0; local degree ordering;
isolated critical point 0 of t

Return:
 
list v;  V-filtration on H''/s*H''
  ideal v[1];
    number v[1][i];  V-filtration index of i-th spectral number
  intvec v[2];
    int v[2][i];  multiplicity of i-th spectral number
  list v[3];
    module v[3][i];  vector space of i-th graded part in terms of v[4]
  ideal v[4];  monomial vector space basis of H''/s*H''
  ideal v[5];  standard basis of Jacobian ideal

Example:
 
See also: spectrum_lib.


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