#8899: Implement non commutative symmetric functions
--------------------------------------------------------------------------------+
Reporter: nthiery
| Owner: sage-combinat
Type: enhancement
| Status: needs_work
Priority: major
| Milestone: sage-wishlist
Component: combinatorics
| Resolution:
Keywords: sd40
| Work issues: include new files in documentation ; clean up ReST markup
Report Upstream: N/A
| Reviewers:
Authors: Jason Bandlow, Chris Berg, Franco Saliola, Nicolas M. ThiƩry
| Merged in:
Dependencies: #12953, #12956, #12959, #13238, #13243
| Stopgaps:
--------------------------------------------------------------------------------+
Comment (by saliola):
Replying to [comment:13 saliola]:
> Two new small patches.
>
> 1. {{{trac_11929_8899-fix_skewby-fs.patch:}}} Fixes things so that the
following raises an error:
> {{{
> F([2,1]).skew_by([1])
> }}}
>
> 2. {{{trac_11929_8899-add_degree_to_elementmethods-fs.patch:}}} addes
{{{ElementMethods.degree}}} and {{{ElementMethods.is_homogeneous}}} to
{{{GradedAlgebrasWithBasis}}} (I extracted these from a separate patch on
the sage-combinat queue).
>
> '''Outstanding question about the degree of an element:''' what do we
want as the default behaviour? Should it:
> a. raise an error if the element is not homogeneous; or
> b. return the maximum of the degrees of the homogeneous summands?
Based on the [https://groups.google.com/d/topic/sage-combinat-
devel/pTjdBFeePWg/discussion discussion on sage-combinat-devel], I updated
[attachment:trac_11929_8899-add_degree_to_elementmethods-fs.patch]:
- add methods {{{maximal_degree}}} and {{{homogeneous_degree}}} in
{{{GradedAlgebrasWithBasis}}}
- as a default in {{{GradedAlgebrasWithBasis}}}, set {{{degree =
homogeneous_degree}}}
- for NCSF/QSym, {{{degree}}} is redefined to be {{{maximal_degree}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8899#comment:14>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.