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D.5.4.6 spectrum

Procedure from library gaussman.lib (see section gaussman_lib).

Usage:

spectrum(t); poly t

Assume:

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

Return:
list sp;  singularity spectrum of t
  ideal sp[1];
    number sp[1][i];  i-th spectral number
  intvec sp[2];
    int sp[2][i];  multiplicity of i-th spectral number

Example:

LIB "gaussman.lib";
ring R=0,(x,y),ds;
poly t=x5+x2y2+y5;
spprint(spectrum(t));
→ (-1/2,1),(-3/10,2),(-1/10,2),(0,1),(1/10,2),(3/10,2),(1/2,1)

See also: spectrum_lib.


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            User manual for Singular version 2-0-4, October 2002, generated by texinfo.