#16985: Poset: Faster is_dual()
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: new
Priority: minor | Milestone: sage-wishlist
Component: combinatorics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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For now at Poset class the code for `is_dual()` does just
`is_isomorphic(self.dual())`. It of course works, but is quite slow on
most cases. Before full isomorphic test one can at least check that
cardinalities are same, number of maximal and minimal elements are same
and that sorted lists of in- and out-degrees are same.
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Ticket URL: <http://trac.sagemath.org/ticket/16985>
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