#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 zabrocki):
I take the part about it being correct in `CoxeterGroup` back. It seems
to only be correct for the `CoxeterGroups().example()`.
I assume that you are right in that "Coxeter group category provides a
default implementation for the other" but no one has implemented
`has_right_descent` or `has_left_descent` for any of the finite or affine
`WeylGroups` or `CoxeterGroups` (to an end user of these groups, this is a
bug because it should just raise a `Not Implemented` error).
Is the correct solution then that
(1) someone needs to implement them for each of the types
(2) that the default implementation should be `has_right_descent` should
call `has_descent(self, side=right)`
(3) the default implementation of `has_right_descent` should raise a `Not
Implemented` error
(4) something else?
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Ticket URL: <http://trac.sagemath.org/ticket/15456#comment:5>
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