#17299: nasty bug in modular symbols, which is likely very easy to fix.
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Reporter: was | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: modular forms | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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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.
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Ticket URL: <http://trac.sagemath.org/ticket/17299>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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