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7.7.3.0. annfs2
Procedure from library dmod.lib (see dmod_lib).
- Usage:
- annfs2(I, F [,eng]); I an ideal, F a poly, eng an optional int
- Return:
- ring
- Purpose:
- compute the annihilator ideal of f^s in the Weyl Algebra,
based on the output of Sannfs-like procedure
annfs2 uses shorter expressions in the variable s (the idea of Noro).
- Note:
- activate the output ring with the
setring command. In this ring,
- the ideal LD (which is a Groebner basis) is the annihilator of f^s,
- the list BS contains the roots with multiplicities of the BS polynomial.
If eng <>0, std is used for Groebner basis computations,
otherwise and by default slimgb is used.
- Display:
- If
printlevel =1, progress debug messages will be printed,
if printlevel >=2, all the debug messages will be printed.
Example:
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