#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-5.11
Component: algebra |
Resolution:
Keywords: algebra, quiver, module, days49 |
Work issues: Use existing infrastructure for Homspase and Morphism.
Report Upstream: N/A |
Reviewers:
Authors: Jim Stark, Simon King, Mathieu Guay-Paquet, Aladin Virmaux |
Merged in:
Dependencies: #12412, #12413 |
Stopgaps:
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Comment (by SimonKing):
The problem lies in sage.graphs.digraph. It does:
{{{
def reverse(self):
"""
Returns a copy of digraph with edges reversed in direction.
EXAMPLES::
sage: D = DiGraph({ 0: [1,2,3], 1: [0,2], 2: [3], 3: [4], 4:
[0,5], 5: [1] })
sage: D.reverse()
Reverse of (): Digraph on 6 vertices
"""
H = DiGraph(multiedges=self.allows_multiple_edges(),
loops=self.allows_loops())
H.add_vertices(self)
H.add_edges( [ (v,u,d) for (u,v,d) in self.edge_iterator() ] )
name = self.name()
if name is None:
name = ''
H.name("Reverse of (%s)"%name)
return H
}}}
Our digraph has no given name, and thus its reverse gets the name `Reverse
of ()`.
So, it is not convenient, but I think we should not worry about it.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12630#comment:82>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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