#8251: traceback when computing E.torsion_subgroup() for an elliptic curve E
-------------------------------+--------------------------------------------
Reporter: was | Owner: cremona
Type: defect | Status: new
Priority: critical | Milestone: sage-4.5
Component: elliptic curves | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by robertwb):
Easier to reproduce.
{{{
sage: RationalField()
Rational Field
sage: list(JonesDatabase().unramified_outside([3], 3))
[Number Field in a with defining polynomial x^3 - 3*x + 1, Number Field in
a with defining polynomial x^3 - 3]
sage: RationalField()
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (436, 0))
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
/Users/sekhon/<ipython console> in <module>()
/Applications/sage/local/lib/python2.6/site-
packages/sage/rings/rational_field.pyc in __init__(self)
212 print id(self)
213 ParentWithGens.__init__(self, self, category = Fields())
--> 214 self._assign_names(('x',),normalize=False) # ???
215
self._populate_coercion_lists_(element_constructor=rational.Rational,
init_no_parent=True)
216
/Applications/sage/local/lib/python2.6/site-
packages/sage/structure/parent_gens.so in
sage.structure.parent_gens.ParentWithGens._assign_names
(sage/structure/parent_gens.c:2869)()
/Applications/sage/local/lib/python2.6/site-
packages/sage/structure/category_object.so in
sage.structure.category_object.CategoryObject._assign_names
(sage/structure/category_object.c:3287)()
ValueError: variable names cannot be changed after object creation.
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8251#comment:3>
Sage <http://www.sagemath.org>
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