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In this paper Gerhard Opfer claims to have solved Collatz conjecture. Looks like a strange paper to me, but I haven't studied it. How legit does it look to people more specialized in these matters? It would be cool to see it solved....

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 @Henno: This is not the place to discuss potential proofs: see here: mathoverflow.net/questions/34978/… – vonjd Jun 2 2011 at 18:06
Is this question appropriate for math.SE? – Dan Brumleve Jun 3 2011 at 3:49
Meta thread - meta.mathoverflow.net/discussion/1059/… – François G. Dorais♦ Jun 3 2011 at 20:23
See the (also closed) math.SE question: math.stackexchange.com/q/43051/954 – Simon Jun 4 2011 at 7:59
As of June 17, 2011, Opfer has withdrawn his claim, as you can see from more recent versions of his preprint. – Timothy Chow Jun 21 2011 at 22:04

closed as off topic by Steve Huntsman, Qiaochu Yuan, Cam McLeman, Torsten Ekedahl, George Lowther Jun 2 2011 at 19:23

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