All,
A power user sent me something akin to:
sage: PermutationGroup([(1,2)])
Permutation Group with generators [(1,2)]
sage: PermutationGroup([('a','b')])
Permutation Group with generators [('a','b')]
sage: PermutationGroup([(0,1)])
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<snip>
ValueError: Invalid permutation vector: [(0, 1)]
We expanded the possibilities for symbol sets, and it would be nice if this
0-index case was picked up properly. I could not find a ticket anywhere,
and will make one unless I hear otherwise that this is known (or "needs
review"!).
For the record, here's a reasonable workaround:
sage: S = SymmetricGroup([0,1])
sage: S.subgroup([(0,1)])
Subgroup of (Symmetric group of order 2! as a permutation group) generated
by [(0,1)]
Rob
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