#12630: Add representations of quivers and quiver algebras to sage
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Reporter: JStarx | Owner: AlexGhitza
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.2
Component: algebra | Resolution:
Keywords: algebra, quiver, | Merged in:
module, days49 | Reviewers: Simon King
Authors: Jim Stark, Simon | Work issues: QuiverRepHom must not
King, Mathieu Guay-Paquet, Aladin | implement __call__
Virmaux | Commit:
Report Upstream: N/A | 50eb7bde26c2a0c688e0500918597591097aa0cb
Branch: | Stopgaps:
public/combinat/quivers |
Dependencies: #12412, #12413, |
#14806, #15491, #15623, #15810 |
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Comment (by SimonKing):
Aha! That's why: The `_coerce_map_from_` method compares the underlying
quivers by `<=`. In the original implementation, we had a dedicated class
for quivers, with a `__cmp__` method. But now we are using `DiGraph`, and
their comparison is not what we want.
Hence, in `_coerce_map_from_` we need to do what we used to do in
`__cmp__`---we need a subgraph check.
--
Ticket URL: <http://trac.sagemath.org/ticket/12630#comment:223>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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