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Feb 24, 2010 at 13:53 history edited Joel David Hamkins CC BY-SA 2.5
Improved exposition.
Feb 24, 2010 at 5:32 history edited Joel David Hamkins CC BY-SA 2.5
Added characterization theorem at the end
Feb 24, 2010 at 4:32 history edited Joel David Hamkins CC BY-SA 2.5
added 178 characters in body
Feb 24, 2010 at 4:25 history edited Joel David Hamkins CC BY-SA 2.5
added 457 characters in body; added 21 characters in body
Feb 24, 2010 at 4:20 history edited Joel David Hamkins CC BY-SA 2.5
added 345 characters in body
Feb 24, 2010 at 4:14 history answered Joel David Hamkins CC BY-SA 2.5