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 Post subject: ... is no standard basis but I'm sure it isPosted: Thu Aug 11, 2005 5:32 pm
Hi,

I've got a few mononomial in a list (actually it's a list(list())) and I'm checking if another polynomial is dividable by one of them. Right now im using reduce, but Singular complains that "_ is no standardbasis", but I'm shure it is, because it's a monomial. Any workaround/other way to check dividability.

Regards

email: glowwormy@web.de
Posted in old Singular Forum on: 2004-03-23 10:36:38+01

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 Post subject: Re: ... is no standard basis but I'm sure it isPosted: Thu Aug 11, 2005 8:48 pm

Joined: Thu Aug 11, 2005 8:03 pm
Posts: 37
Location: RWTH Aachen, Germany
Hi, Stefan,
Quote:
> Hi,
>
> I've got a few mononomial in a list (actually it's a
> list(list())) and I'm checking if another polynomial is
> dividable by one of them. Right now im using reduce, but
> Singular complains that "_ is no standardbasis", but I'm
> shure it is, because it's a monomial.

Assume you have the ideal I= <xy^2, x^2y> in the ring K[x,y].

When you compute I=std(I), the attribute "IsSB" of the ideal I will be set to 1. (You can check it executing "attrib(I);")

Otherwise, even is it is a standard basis, you will get such warning.

The right solution would be to gather monomials you need in the ideal, compute its standard basis and then perform reductions.

Quote:
> Any workaround/other way to check dividability.

Depending on what you need, you can use functions "simplify", division "/" or "coef". Please consult the Singular manual for details.
Quote:
>
> Regards

Have fun,

_________________
Viktor Levandovskyy

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