#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 | Work issues:
Report Upstream: N/A | Reviewers: jbandlow
Authors: arattan, Darij Grinberg | Merged in:
Dependencies: #8392 | Stopgaps:
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Comment (by aschilling):
Hi Darij,
> In other news, I've added documentation to {{{insert_word}}}, slightly
improved that of {{{catabolism}}} and {{{lambda_catabolism}}}, and fixed a
couple more typos. Since I don't know anything about catabolism, can you
tell me if it's OK that {{{catabolism_sequence(Tableau([]))}}} does not
terminate? I'm hesitating to call it a bug as long as I don't know if this
should be defined at all for an empty tableau.
Yes, probably you want that catabolism_sequence on the empty tableau is
the empty tableau. The code only checks if the tableau is of height 1, but
catabolism on the empty tableau is itself and hence it goes into an
infinite loop.
Best,
Anne
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7983#comment:13>
Sage <http://www.sagemath.org>
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