#17092: Quivers incorrectly assume labels are checked for equality of graphs
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Reporter: emassop | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: graph theory | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Over at ticket #17086 the hash of `GenericGraph` was fixed to agree with
equality of `GenericGraph`. This caused doctest failure in
`src/sage/quivers/path_semigroup.py`.
Equality of un-'weighted' `GenericGraph` ignores edge labels, which seems
nonsensical to me for `/path_semigroup`. So each digraph used for path
semigroups should be 'weighted'. Running `git grep path_semigroup` shows
that this is certainly not done.
I see these options:
* change lots of code to make the appropriate digraphs weighted;
* change equality of graphs to take edge labels into account, possibly
breaking other code;
* change `PathSemigroup` to check for weightedness, and perhaps set
'weighted' in `.path_semigroup`.
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Ticket URL: <http://trac.sagemath.org/ticket/17092>
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