#15341: Hashing of GammaH congruence groups is broken
---------------------------------+-------------------------
Reporter: mderickx | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-5.13
Component: modular forms | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by mderickx:
Old description:
> To quote the python reference manual:
> http://docs.python.org/2/reference/datamodel.html#object.__hash__
>
> The only required property is that objects which compare equal have the
> same hash value;
>
> However:
> {{{
> G1=GammaH(21,[4])
> G2=GammaH(21,[4,16])
> print G1==G2
> print hash(GammaH(21,[4,16]))
> print hash(GammaH(21,[4]))
> }}}
>
> prints:
>
> {{{
> True
> 8309769839484863814
> 1170799062851396877
> }}}
New description:
To quote the python reference manual:
http://docs.python.org/2/reference/datamodel.html#object.__hash__
The only required property is that objects which compare equal have the
same hash value;
However:
{{{
G1=GammaH(21,[4])
G2=GammaH(21,[4,16])
print G1==G2
print hash(G1)
print hash(G2)
}}}
prints:
{{{
True
1170799062851396877
8309769839484863814
}}}
--
--
Ticket URL: <http://trac.sagemath.org/ticket/15341#comment:1>
Sage <http://www.sagemath.org>
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