#4795: Modular forms over finite fields need work
---------------------------------+---------------------------
Reporter: craigcitro | Owner: craigcitro
Type: defect | Status: new
Priority: major | Milestone: sage-5.11
Component: modular forms | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Dependencies:
Stopgaps: |
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Changes (by AlexGhitza):
* upstream: => N/A
Comment:
Under 5.10, there's a coercion issue at the very beginning:
{{{
sage: m = ModularForms(DirichletGroup(8).1, 2, GF(7))
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
<ipython-input-3-a5d6a0e5413b> in <module>()
----> 1 m = ModularForms(DirichletGroup(Integer(8)).gen(1), Integer(2),
GF(Integer(7)))
/opt/sage/local/lib/python2.7/site-
packages/sage/modular/modform/constructor.pyc in ModularForms(group,
weight, base_ring, use_cache, prec)
343 M = ambient_eps.ModularFormsAmbient_eps(eps, weight)
344 if base_ring != eps.base_ring():
--> 345 M = M.base_extend(base_ring) #
ambient_R.ModularFormsAmbient_R(M, base_ring)
346
347 if M is None:
/opt/sage/local/lib/python2.7/site-packages/sage/modular/modform/space.pyc
in base_extend(self, base_ring)
430 """
431 if not base_ring.has_coerce_map_from(self.base_ring()):
--> 432 raise ValueError, "No coercion defined"
433 else:
434 return self.change_ring(base_ring)
ValueError: No coercion defined
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/4795#comment:2>
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