#14608: Symbolic functions break the __hash__ contract
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Reporter: vbraun | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-5.10
Component: symbolics | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by vdelecroix):
Within Sage it is impossible to satisfy "equal objects must have the same
hash if they are hashable" because equality is too laxist.
{{{
sage: RIF(2) == 2
True
sage: hash(RIF(2))
6400019251
sage: hash(2)
2
}}}
Or
{{{
sage: bool(pi == RR(pi))
True
sage: hash(pi)
2650685528
sage: hash(RR(pi))
1826823505
}}}
You can not hope to solve this problem with one ticket (because the
Symbolic ring contains all Sage objects) !
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14608#comment:1>
Sage <http://www.sagemath.org>
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