#20172: Matroid Basis Axiom Test has a bug
-------------------------+-------------------------------------------------
Reporter: Stefan | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.1
Component: matroid | Keywords: matroids,
theory | BasisExchangeMatroid, BasisMatroid, axiom,
Merged in: | is_valid
Reviewers: | Authors:
Work issues: | Report Upstream: N/A
Commit: | Branch:
Stopgaps: | Dependencies:
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As reported by Charles Wang on the sage-matroid list:
{{{
sage: M=Matroid(groundset='1234',bases=['12','13','23','34'])
sage: M.is_valid() # Should return False
True
}}}
The fix is easy and forthcoming.
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Ticket URL: <http://trac.sagemath.org/ticket/20172>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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