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Bug in is_isomorphic for multigraphs ! #13114
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nathanncohen
mannequin
changed the title
Bug in is_isomorphic with unlabelled multiple edges !
Bug in is_isomorphic for multigraphs !
Jun 13, 2012
comment:2
Attachment: trac_13114.patch.gz Please fill in your real name as Author. |
comment:3
Nathann is far away so I fill it for him. |
Author: Nathann Cohen |
comment:4
I did the following test, among others:
For me the patch is working correctly. Build OK, functionality OK, long tests OK, docbuild OK. |
Reviewer: David Coudert |
Merged: sage-5.3.beta2 |
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In order to test for isomorphism of multigraphs, multiple edges are converted to labeled edges whose label encodes the multiplicity.
Yeah. But if, on the other side, we chose to ignore edge labels for isomorphism then the information of multiplicity vanishes !
The bug has been reported by Stavros Garoufalidis.
Nathann
CC: @rlmill @dcoudert
Component: graph theory
Author: Nathann Cohen
Reviewer: David Coudert
Merged: sage-5.3.beta2
Issue created by migration from https://trac.sagemath.org/ticket/13114
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