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7.7.3.0. SannfsBFCT
Procedure from library dmod.lib (see dmod_lib).
- Usage:
- SannfsBFCT(f [,a,b,c]); f a poly, a,b,c optional ints
- Return:
- ring
- Purpose:
- compute a Groebner basis either of Ann(f^s)+<f> or of
Ann(f^s)+<f,f_1,...,f_n> in D[s]
- Note:
- Activate the output ring with the
setring command.
This procedure, unlike SannfsBM, returns the ring D[s] with an anti-
elimination ordering for s.
The output ring contains an ideal LD , being a Groebner basis
either of Ann(f^s)+<f>, if a=0 (and by default), or of
Ann(f^s)+<f,f_1,...,f_n>, otherwise.
Here, f_i stands for the i-th partial derivative of f.
If b<>0, std is used for Groebner basis computations,
otherwise, and by default slimgb is used.
If c<>0, std is used for Groebner basis computations of
ideals <I+J> when I is already a Groebner basis of <I>.
Otherwise, and by default the engine determined by the switch b is
used. Note that in the case c<>0, the choice for b will be
overwritten only for the types of ideals mentioned above.
This means that if b<>0, specifying c has no effect.
- 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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