#7983: Notion of descent/major index in tableau.py is not mathematically
standard
-----------------------------+----------------------------------------------
Reporter: jbandlow | Owner: sage-combinat
Type: defect | Status: needs_review
Priority: major | Milestone:
Component: combinatorics | Keywords:
Author: | Upstream: N/A
Reviewer: jbandlow | Merged:
Work_issues: |
-----------------------------+----------------------------------------------
Changes (by arattan):
* status: new => needs_review
* reviewer: => jbandlow
Comment:
I have made a patch that resolves this issue.
What I have done is renamed the old methods 'major_index' and 'descents'
to 'i_major_index' and 'i_descents'. From what I can tell, only one other
method refers to either of these methods and that is 'inversion', and I
have not changed that at all except to refer to the new 'i_descents' (in
particular I have not changed the name of 'inversion').
I have then made new methods called 'major_index' and 'descents' which use
a more standard definition (i.e. the one on pages 361 and 363 of
Enumerative Combinatorics Vol 2 by R. Stanley).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7983#comment:1>
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.
