#19055: Tableau hash depends on subclass
-------------------------------------+-------------------------------------
Reporter: darij | Owner:
Type: PLEASE CHANGE | Status: new
Priority: major | Milestone: sage-6.9
Component: combinatorics | Keywords: tableaux, hashing
Merged in: | Authors: Darij Grinberg
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | public/combinat/tableau_hash
4eae243a0ab63dc43b0afdf1db2d94b2f3a21756| Dependencies:
Stopgaps: |
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Found by Nicolas and Anne:
{{{
sage: t = StandardTableaux([3,2,1]).an_element()
sage: tt = Tableau(t[:])
sage: t == tt
True
sage: hash(t) == hash(tt)
False
}}}
Objects that compare as equal should have equal hashes.
The branch fixes this by factoring the hash through the underlying list
(or, rather, tuple) that represents the tableau. Is that a good idea, or
should we preserve something more about the class?
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Ticket URL: <http://trac.sagemath.org/ticket/19055>
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