#16367: IncidenceStructure.automorphism_group : correct labels
-----------------------------+---------------------------------
Reporter: ncohen | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.3
Component: combinatorics | Keywords:
Merged in: | Authors: Nathann Cohen
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies: #16358
Stopgaps: |
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PermutationGroup can handle permutations on any set, and not only 1..n.
Given that the designs are defined on `range(v)`, let us avoid some
mistakes !
Before
{{{
sage: designs.BalancedIncompleteBlockDesign(7,3).automorphism_group()
Permutation Group with generators [(4,5)(6,7), (4,6)(5,7), (2,3)(6,7),
(2,4)(3,5), (1,2)(5,6)]
sage: designs.BalancedIncompleteBlockDesign(7,3).points()
[0, 1, 2, 3, 4, 5, 6]
}}}
After
{{{
sage: designs.BalancedIncompleteBlockDesign(7,3).automorphism_group()
Permutation Group with generators [(2,4)(5,6), (2,5)(4,6), (1,2)(3,4),
(0,1)(4,6)]
sage: designs.BalancedIncompleteBlockDesign(7,3).points()
[0, 1, 2, 3, 4, 5, 6]
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/16367>
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