#20146: Bug in computing the Gröner fan
-------------------------+-------------------------------------------------
Reporter: stumpc5 | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.1
Component: | Keywords: Gröbner basis, Gröbner fan,
commutative algebra | gfan
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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I get
{{{
sage: P =
PolynomialRing(QQ,"x11,x12,x13,x14,x15,x21,x22,x23,x24,x25,x31,x32,x33,x34,x35");
x = P.gens(); M = Matrix(3,x)
sage: M
[x11 x12 x13 x14 x15]
[x21 x22 x23 x24 x25]
[x31 x32 x33 x34 x35]
sage: I = P.ideal(M.minors(2))
sage: gf = I.groebner_fan()
sage: rgbs = gf.reduced_groebner_bases()
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call
last)
...
RuntimeError: Unknown
variable:olynomialSequencewith30Polynomialsin15Variable
gfan_bases: parser.cpp:276: virtual Monomial
CharacterBasedParser::parseMonomial(const PolynomialRing&): Assertion `0'
failed.
}}}
The same computation with 3 or 4 columns does work.
--
Ticket URL: <http://trac.sagemath.org/ticket/20146>
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