#19016: A more naive sage.structure.element.__hash__
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Reporter: ncohen | Owner:
Type: defect | Status: new
Priority: blocker | Milestone: sage-6.9
Component: misc | Keywords:
Merged in: | Authors: Nathann Cohen
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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As reported on sage-devel [1], the default hash function implemented in
`Element` makes it very likely that `hash` and `==` will not agree. With
this branch, the hash is constant and set to 0, making it less likely.
Incidentally, it fixes the following bug:
{{{
sage: G = groups.presentation.Cyclic(4)
sage: G.cayley_graph().vertices()
[1, a, a^2, a^-2, a^3, a^-1]
}}}
Nathann
[1]
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Ticket URL: <http://trac.sagemath.org/ticket/19016>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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