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Jan 6, 2014 at 0:14 vote accept István Kovács
Jan 5, 2014 at 22:50 comment added István Kovács Thanks for the answer! Will: It's not a necessary condition, I found this now: sciencedirect.com/science/article/pii/0168007284900423.
Jan 5, 2014 at 22:45 comment added Will Sawin Is this condition necessary? Could one construct a counterexample by assuming the negation?
Jan 5, 2014 at 22:45 history edited Joel David Hamkins CC BY-SA 3.0
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Jan 5, 2014 at 22:30 history answered Joel David Hamkins CC BY-SA 3.0