#15456: fix bug in has_right/left_descents in Weyl group code
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Reporter: zabrocki | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-5.13
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by nthiery):
Hi Mike!
This is not a bug but a feature :-)
When implementing a Coxeter group one can choose to either implement
has_right_descent or has_left_descent (or both), and the Coxeter group
category provides a default implementation for the other, if needed.
Granted, it would be nice if there was a nicer error message mentionning
that at least one of has_left_descent or has_right_descent should be
implemented. However, at this point, we have not generic infrastructure
for this kind of situation, and it would be a bit tedious to do it by hand
(but ideas on how to handle this are welcome!).
Cheers,
--
Ticket URL: <http://trac.sagemath.org/ticket/15456#comment:1>
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