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May 30, 2013 at 12:20 vote accept michael_f
May 24, 2013 at 15:27 answer added bartgol timeline score: 0
May 20, 2013 at 19:45 comment added András Bátkai See also mathoverflow.net/questions/130857/proof-that-l20-tx-l20-tx
May 20, 2013 at 9:58 history asked michael_f CC BY-SA 3.0