#8899: Implement non commutative symmetric functions
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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. Thiéry
| Merged in:
Dependencies: #12953, #12956, #12959, #13238, #13243
| Stopgaps:
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Comment (by 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?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8899#comment:13>
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