#15296: LinearMatroid can't use sets for fundamentals
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Reporter: Stefan | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-5.13
Component: matroid theory | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Several methods in LinearMatroid have an option {{{fundamentals}}}.
Internally, this gets used as a set, and we test things like {{{p in
fundamentals}}}. Even though both {{{p}}} and the elements of
{{{fundamentals}}} come from the same ring or field, it is not guaranteed
(and sometimes false) that {{{p == q}}} implies {{{hash(p) == hash(q)}}}.
The default behavior of these methods should therefore be to test for
equality with each member of {{{fundamentals}}}, instead of relying on the
{{{in}}} keyword. An optional argument (such as
{{{use_fast_fundamental_test}}} with default option False can be used to
speed up computations when appropriate.
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Ticket URL: <http://trac.sagemath.org/ticket/15296>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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