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Jan 17, 2011 at 19:00 vote accept dan
Jan 17, 2011 at 12:25 comment added user6976 @Derek: I consider 'countable" to be of cardinality $\aleph_0$.
Jan 17, 2011 at 10:20 comment added Derek Holt Yet another silly rejoinder: should that be "on every infinite countable ..."?
Jan 15, 2011 at 22:09 comment added user6976 Yes. Every countable group acts faithfully by permutations on every countable (and more than countable) set.
Jan 15, 2011 at 20:49 comment added dave Can these groups act just as functions (not automorphisms)?
Jan 15, 2011 at 14:11 comment added user6976 Yes, I fixed that.
Jan 15, 2011 at 14:11 history edited user6976 CC BY-SA 2.5
added 4 characters in body
Jan 15, 2011 at 12:18 comment added Derek Holt Should that be $|m| \ne |n| \ge 2$ ?
Jan 15, 2011 at 9:51 history answered user6976 CC BY-SA 2.5