#17798: Create a class for Coxeter matrices and types
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Reporter: tscrim | Owner: sage-combinat
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: group theory | Resolution:
Keywords: Coxeter groups, | Merged in:
matrices, types, days64 | Reviewers: Jean-Philippe Labbé,
Authors: Travis Scrimshaw, | Travis Scrimshaw
Jean-Philippe Labbé | Work issues:
Report Upstream: N/A | Commit:
Branch: | 4ca434574be9cfc2412a90113cf98968ae347247
public/combinat/coxeter_matrices-17798| Stopgaps:
Dependencies: #17990, #18152, |
#18743 |
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Comment (by tscrim):
Okay, so the issue which caused the crystals to infinitely recurse is that
the type recognition via `subtype()` did not pass along the appropriate
labels (I'm not 100% sure what was calling `subtype()`...). In particular,
classical types got relabeled by `[0, 1, ...]`, and KR crystals were
sensitive to the labellings. I fixed this (which was indicated by the fact
that we now had to add the relabel to the `subtype` test) and in a
separate commit I made the KR crystals less sensitive to relabellings (but
fixing them altogether is an entirely different issue and would deserve a
separate ticket). What had changed from our previous version was that our
type recognition system did not support relabelling, but now using Dynkin
diagrams it does.
Unfortunately this did not fix the issue for cluster seeds.
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Ticket URL: <http://trac.sagemath.org/ticket/17798#comment:71>
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