I noticed the following:
F = GF(7)
L.<t> = PowerSeriesRing(F,'t')
R.<x,y> = PolynomialRing(L,'x,y')
vector(R.gens())
gives
(x, y)
But
F = GF(2)
L.<t> = PowerSeriesRing(F,'t')
R.<x,y> = PolynomialRing(L,'x,y')
vector(R.gens())
gives
Traceback (most recent call last):
[...]
File "sage/modules/free_module_element.pyx", line 499, in
sage.modules.free_module_element.vector
(build/cythonized/sage/modules/free_module_element.c:5257)
File "sage/modules/free_module_element.pyx", line 596, in
sage.modules.free_module_element.prepare
(build/cythonized/sage/modules/free_module_element.c:5781)
File
"/usr/lib/sagemath/local/lib/python2.7/site-packages/sage/structure/sequence.py",
line 293, in Sequence
return PolynomialSequence(x, universe, immutable=immutable, cr=cr,
cr_str=cr_str)
File
"/usr/lib/sagemath/local/lib/python2.7/site-packages/sage/rings/polynomial/multi_polynomial_sequence.py",
line 338, in PolynomialSequence
elif K.degree() == 1:
File "sage/structure/parent.pyx", line 840, in
sage.structure.parent.Parent.__getattr__
(build/cythonized/sage/structure/parent.c:7907)
File "sage/structure/misc.pyx", line 251, in
sage.structure.misc.getattr_from_other_class
(build/cythonized/sage/structure/misc.c:1684)
AttributeError: 'PowerSeriesRing_over_field_with_category' object has no
attribute 'degree'
I assume this is because power series over GF(2) are implemented specially
(and more efficiently) than over arbitrary finite ground field. Still I
would like to get the code to run in the second setting. Does anybody know
how to do it? (This is really two questions: "does anybody know how to fix
the implementation of PowerSeriesRing(GF(2))?" And "does anybody know a
quick workaround?")
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