#7983: Notion of descent/major index in tableau.py is not mathematically
standard
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Reporter: jbandlow | Owner: sage-combinat
Type: defect | Status: needs_review
Priority: major | Milestone:
Component: combinatorics | Resolution:
Keywords: combinat, tableaux, days49 | Work issues:
Report Upstream: N/A | Reviewers: Jason Bandlow,
Travis Scrimshaw
Authors: arattan, Darij Grinberg | Merged in:
Dependencies: #8392 | Stopgaps:
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Changes (by tscrim):
* reviewer: jbandlow => Jason Bandlow, Travis Scrimshaw
Old description:
> The 'descents' and 'major_index' methods of a Tableau return what are
> more properly known as 'i_descents' and the 'i_maj' statistic. These
> should be renamed accordingly, and the proper statistics put in their
> place. See, eg., Richard Stanley--Enumerative Combinatorics, Vol. 2 for
> a reference to the usual definition.
>
> *EDIT* by Darij:
>
> * Apply: [attachment: trac_7983-major_index_and_other_tableau_fixes-
> dg.patch]
New description:
The 'descents' and 'major_index' methods of a Tableau return what are more
properly known as 'i_descents' and the 'i_maj' statistic. These should be
renamed accordingly, and the proper statistics put in their place. See,
eg., Richard Stanley--Enumerative Combinatorics, Vol. 2 for a reference to
the usual definition.
*EDIT* by Darij:
Apply:
* [attachment:trac_7983-major_index_and_other_tableau_fixes-dg.patch]
* [attachment:trac_7983-review-ts.patch]
--
Comment:
Hey Darij,
Here's the review patch.
Travis
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7983#comment:18>
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