#15476: Involutions on NSym and QSym part I
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Reporter: darij | Owner:
Type: | Status: new
enhancement | Milestone: sage-5.13
Priority: major | Keywords: ncsf, nsym, qsym, sage-
Component: | combinat, symmetric functions, compositions
combinatorics | Authors: Darij Grinberg
Merged in: | Report Upstream: N/A
Reviewers: | Branch:
Work issues: | Dependencies:
Commit: |
Stopgaps: |
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This got much longer than I expected it to be because there are three
"classical" involution on each of NSym and QSym and each can be computed
on various bases. I ended up implementing only two of the involutions
(star=rho and psi), leaving out omega (which is just a rescaled antipode)
for part II.
The patch also fixes some doc, moves a reference, and changes various
invocations of `Composition(spam)` to `Compositions()(spam)` for speed
reasons (when `spam` really is just a list). Could a `_Compositions` (akin
to `_Partitions`) be of use?
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Ticket URL: <http://trac.sagemath.org/ticket/15476>
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