#15205: NSym (NCSF): bugs or weird design decisions
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Reporter: darij | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-5.12
Component: | Keywords: sage-combinat, NSym, NCSF,
combinatorics | Sym, symmetric-functions
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies: #15164
Stopgaps: |
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Here are the issues that haven't been deal with in #15164:
* I don't understand why the internal product is implemented in
{{{ncsf_qsym/generic_basis_code.py}}} rather than {{{ncsf_qsym/ncsf.py}}}.
Isn't {{{generic_basis_code.py}}} for methods shared between QSym and
NSym? There is no internal product on QSym.
* This here is a doctest which has been around before me:
{{{
sage: N = NonCommutativeSymmetricFunctions(QQ)
sage: S = N.complete()
sage: S.internal_product
Generic endomorphism of Non-Commutative Symmetric
Functions over the Rational Field in the Complete basis
}}}
The output makes no sense: The internal product is not an endomorphism of
anything. I understand it is implemented in some weirdly curried form, but
then its target should be a Hom space.
* I was trying to overshadow the {{{verschiebung}}} function I implemented
on a generic NSym basis by a specific implementation on the ribbon basis.
So I've added it under {{{class ElementMethods:}}} in the {{{class
Ribbon}}}. But it doesn't get precedence over the generic implementation
at runtime! What am I doing wrong? If this can be explained, I'll
implement the verschiebung on a few more bases (Psi and Phi both have very
simple formulas).
--
Ticket URL: <http://trac.sagemath.org/ticket/15205>
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