But it's working otherwise!  Meaning that if I don't pass to the cuspidal 
subspace, it appears to be correctly computing slopes.  And it is so much 
faster than working over Q(zeta_11)...

On Tuesday, October 20, 2015 at 2:33:59 PM UTC-4, robert....@gmail.com 
wrote:
>
> The following code crashes and asks me to report this as a bug:
>
> sage: Qp = pAdicField(11)
>
> sage: G = DirichletGroup(11,Qp)
>
> sage: omega = G.0
>
> sage: M = ModularSymbols(omega^2,2)
>
> sage: M
>
> Modular Symbols space of dimension 2 and level 11, weight 2, character [4 
> + 7*11 + 9*11^2 + 5*11^3 + 2*11^4 + 9*11^5 + 8*11^6 + 7*11^8 + 8*11^9 + 
> 6*11^10 + 6*11^11 + 5*11^12 + 5*11^13 + 5*11^14 + 7*11^15 + 10*11^16 + 
> 5*11^17 + 3*11^18 + 5*11^19 + O(11^20)], sign 0, over 11-adic Field with 
> capped relative precision 20
>
> sage: M.cuspidal_submodule()
>
> ---------------------------------------------------------------------------
>
> AssertionError                            Traceback (most recent call 
> last)
>
> <ipython-input-77-62b9556627c0> in <module>()
>
> ----> 1 M.cuspidal_submodule()
>
>
>
> /Applications/sage/local/lib/python2.7/site-packages/sage/modular/modsym/ambient.pyc
>  
> in cuspidal_submodule(self)
>
> *   1399*                 d = self._cuspidal_submodule_dimension_formula()
>
> *   1400*                 if not d is None:
>
> -> 1401                     assert d == S.dimension(), "According to 
> dimension formulas the cuspidal subspace of \"%s\" has dimension %s; 
> however, computing it using modular symbols we obtained %s, so there is a 
> bug (please report!)."%(self, d, S.dimension())
>
> *   1402*             self.__cuspidal_submodule = S
>
> *   1403*         return self.__cuspidal_submodule
>
>
> AssertionError: According to dimension formulas the cuspidal subspace of 
> "Modular Symbols space of dimension 2 and level 11, weight 2, character [4 
> + 7*11 + 9*11^2 + 5*11^3 + 2*11^4 + 9*11^5 + 8*11^6 + 7*11^8 + 8*11^9 + 
> 6*11^10 + 6*11^11 + 5*11^12 + 5*11^13 + 5*11^14 + 7*11^15 + 10*11^16 + 
> 5*11^17 + 3*11^18 + 5*11^19 + O(11^20)], sign 0, over 11-adic Field with 
> capped relative precision 20" has dimension 1345499989865120018402; 
> however, computing it using modular symbols we obtained 0, so there is a 
> bug (please report!).
>

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