The following commands worked find in sage 4.3.
E=EllipticCurve('11a1')
E.torsion_subgroup();
However in sage 4.3.2 they give m the following error
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_28.py", line 9, in <module>
open("___code___.py","w").write("# -*- coding: utf-8 -*-\n" +
_support_.preparse_worksheet_cell(base64.b64decode("RT1FbGxpcHRpY0N1cnZlKCcxMWExJykKRS50b3JzaW9uX3N1Ymdyb3VwKCk7"),globals())
+"\n"); execfile(os.path.abspath("___code___.py"))
File "", line 1, in <module>
File "/private/var/folders/6r/6rhDNnQhH9aXA0rGlw4Jbk++8Bk/-Tmp-/
tmpSaWNtz/___code___.py", line 3, in <module>
E.torsion_subgroup();
File "", line 1, in <module>
File "/Applications/sage/local/lib/python2.6/site-packages/sage/
schemes/elliptic_curves/ell_rational_field.py", line 3515, in
torsion_subgroup
self.__torsion_subgroup =
ell_torsion.EllipticCurveTorsionSubgroup(self, algorithm)
File "/Applications/sage/local/lib/python2.6/site-packages/sage/
schemes/elliptic_curves/ell_torsion.py", line 159, in __init__
if self.__K is RationalField() and algorithm in
pari_torsion_algorithms:
File "/Applications/sage/local/lib/python2.6/site-packages/sage/
rings/rational_field.py", line 208, in __init__
self._assign_names(('x',),normalize=False) # ???
File "parent_gens.pyx", line 327, in
sage.structure.parent_gens.ParentWithGens._assign_names (sage/
structure/parent_gens.c:2854)
File "category_object.pyx", line 336, in
sage.structure.category_object.CategoryObject._assign_names (sage/
structure/category_object.c:3286)
ValueError: variable names cannot be changed after object creation.
Please help. My actually program is much longer, but I went through
each function I was using and found that torsion_subgroup() was the
one that was giving me error.
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