#12566: finding modular symbols space of given sign attached to modular abelian
variety is broken in some cases
-----------------------------+----------------------------------------------
Reporter: was | Owner: craigcitro
Type: defect | Status: new
Priority: major | Milestone: sage-5.0
Component: modular forms | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
-----------------------------+----------------------------------------------
{{{
wstein@sage:~$ sage
----------------------------------------------------------------------
| Sage Version 4.8, Release Date: 2012-01-20 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: J = J0(188)[0]
sage: J.modular_symbols(1)
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call
last)
/home/wstein/<ipython console> in <module>()
/usr/local/share/sage-4.8/local/lib/python2.6/site-
packages/sage/modular/abvar/abvar.pyc in modular_symbols(self, sign)
3773 M = self._modular_symbols().modular_symbols_of_sign(sign)
3774 if (sign != 0 and M.dimension() != self.dimension()) or
(sign == 0 and M.dimension() != 2*self.dimension()):
-> 3775 raise RuntimeError, "unable to determine sign (=%s)
space of modular symbols"%sign
3776 return M
3777
RuntimeError: unable to determine sign (=1) space of modular symbols
}}}
This is also broken in sage-5.0.beta3. I have some reason to believe this
worked fine a year ago...
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12566>
Sage <http://www.sagemath.org>
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