#17299: nasty bug in modular symbols, which is likely very easy to fix.
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Reporter: was | Owner: haochen_uw
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: modular forms | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/haochen_uw/latexrepbug | 35081a653922bc15298651161d307d8e9700bb80
Dependencies: | Stopgaps:
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Description changed by was:
Old description:
> I almost just got in trouble doing some research due to the following
> rather serious bug in modular symbols:
>
> {{{
> /scratch/wstein/sage-6.4.rc1$ ./sage
> ┌────────────────────────────────────────────────────────────────────┐
> │ Sage Version 6.4.rc1, Release Date: 2014-11-01 │
> │ Type "notebook()" for the browser-based notebook interface. │
> │ Type "help()" for help. │
> └───────────────────────────────────────────────────sage: x =
> EllipticCurve('64a1').modular_symbol_space(sign=1).basis()[0]
> sage: x.modular_symbol_rep()
> {-1/3, -1/4} - {1/5, 1/4}
> sage: latex(x.modular_symbol_rep())
> \left\{\frac{-1}{3}, \frac{-1}{4}\right\}
> }}}
>
> Notice that the latex representation completely omits the second summand.
> I was using show(x) to typeset output nicely, and getting massively
> misled.
New description:
I almost just got in trouble doing some research due to the following
rather serious bug in modular symbols:
{{{
/scratch/wstein/sage-6.4.rc1$ ./sage
│ Sage Version 6.4.rc1, Release Date: 2014-11-01 │
sage: x = EllipticCurve('64a1').modular_symbol_space(sign=1).basis()[0]
sage: x.modular_symbol_rep()
{-1/3, -1/4} - {1/5, 1/4}
sage: latex(x.modular_symbol_rep())
\left\{\frac{-1}{3}, \frac{-1}{4}\right\}
}}}
Notice that the latex representation completely omits the second summand.
I was using show(x) to typeset output nicely, and getting massively
misled.
--
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Ticket URL: <http://trac.sagemath.org/ticket/17299#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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