#18264: make map_coefficients in modules_with_basis safer or more general
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Reporter: mantepse | Owner:
Type: enhancement | Status: needs_work
Priority: minor | Milestone: sage-6.7
Component: algebra | Resolution:
Keywords: map_coefficients, | Merged in:
modules_with_basis, base_ring, | Reviewers: Nicolas M. Thiéry
check arguments | Work issues:
Authors: Martin Rubey | Commit:
Report Upstream: N/A | 985e716e917594185bf6ac44f9a602f8bd92f545
Branch: | Stopgaps:
u/mantepse/make_map_coefficients_in_modules_with_basis_safer_or_more_general|
Dependencies: |
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Comment (by mantepse):
I investigated the failure in
`sage.algebras.steenrod.steenrod_algebra.SteenrodAlgebra_generic.coproduct`,
which is actually not a real failure:
{{{
Failed example:
SteenrodAlgebra(p=11, profile=((), (2,1,2))).Q(0,2).coproduct()
Expected:
1 # Q_0 Q_2 + Q_0 # Q_2 + Q_0 Q_2 # 1 - Q_2 # Q_0
Got:
1 # Q_0 Q_2 + Q_0 # Q_2 + Q_0 Q_2 # 1 + 10*Q_2 # Q_0
}}}
The `p=11` in the example means that the coefficient ring is the field
with 11 elements, so -1 and 10 are actually the same thing.
--
Ticket URL: <http://trac.sagemath.org/ticket/18264#comment:23>
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