#15189: LinearMatroid.is_field_isomorphic fails on some occasions
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Reporter: Stefan | Type: defect
Status: new | Priority: major
Milestone: sage-5.12 | Component: matroid theory
Resolution: | Report Upstream: N/A
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ADD DESCRIPTION
The following code should return False:
{{{
sage: M = Matroid(ring=GF(5), reduced_matrix=[[1,0,3],[0,1,1],[1,1,0]])
sage: N = Matroid(ring=GF(5), reduced_matrix=[[1,0,1],[0,1,1],[1,1,0]])
sage: M.is_field_isomorphic(N)
True
}}}
Indeed:
{{{
sage: any(M.is_field_isomorphism(N, p) for p in Permutations(range(6)))
False
}}}
The cause is a recursive call gone wrong in set_system.pyx.
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Ticket URL: <http://trac.sagemath.org/ticket/15189>
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