#15245: Pfaffian of a skew-symmetric matrix
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Reporter: darij | Owner:
Type: enhancement | Status:
Priority: major | positive_review
Component: combinatorics | Milestone: sage-5.13
Keywords: matrix, sage-combinat, | Resolution:
pfaffian | Merged in:
Authors: Darij Grinberg | Reviewers: Travis
Report Upstream: N/A | Scrimshaw
Branch: | Work issues:
Dependencies: #14117 | Commit:
| Stopgaps:
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Comment (by darij):
Not sure about it. {{{is_skewsymmetric}}} should be a tad slower than
{{{is_alternating}}} (not seriously so -- it just calls diagonal elements
twice rather than once). And I never understood what a characteristic of a
ring is; chances are this is another thing not consistently understood in
Sage. What we probably cannot do is ask whether the characteristic is not
2; if anything, we should ask for 2 to be invertible. But even then, I
fear that excepting the {{{NotImplementedError}}} errors will ruin the
speed benefits we get from unifying the code.
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Ticket URL: <http://trac.sagemath.org/ticket/15245#comment:20>
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