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kwankyu
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Post subject: A bug in a ring with matrix ordering  Posted: Wed Jan 08, 2020 4:11 am |
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Joined: Wed Aug 11, 2010 6:49 pm
Posts: 2
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Let us create a ring with a matrix ordering:
{{{
> intmat m[3][3] = 3, 0, 1, 0, 1, 0, 0, 0, 1;
> ring R = 0, (x,y,z), M(m);
> x > 1;
1
> y > 1;
1
> z > 1;
1
}}}
Hence the monomial ordering of R is a well-ordering, and the value of internal attribute `OrdSgn` of R should be 1. But presently `OrdSgn` of R is set to -1. There seems to be a bug in the implementation of `rCheckOrdSgn` function in `libpolys/polys/monomials/ring.cc` file.
This bug was revealed while fixing a bug of Sage tracked in #28954.
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hannes
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Post subject: Re: A bug in a ring with matrix ordering Posted: Fri Jan 10, 2020 3:55 pm |
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Joined: Wed May 25, 2005 4:16 pm
Posts: 275
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fixed with git commit 3484489a559567285e5422a2a18fd88fb5a60600
Author: Hans Schoenemann <hannes@mathematik.uni-kl.de>
Date: Fri Jan 10 14:53:21 2020 +0100
fix: OrdSgn for matrix orderings with 0 in first row
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kwankyu
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Post subject: Re: A bug in a ring with matrix ordering Posted: Mon Jan 13, 2020 5:41 am |
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Joined: Wed Aug 11, 2010 6:49 pm
Posts: 2
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I checked that the patch works well in Sage. Thank you!
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