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Jan 15, 2015 at 13:33 comment added Martin Sleziak It is probably not worth bumping 5 years old post with such a trivial edit, but for the sake of better readability, the condition is: If $a,c\in S$ and $b\in P$ and $a\le b\le c$ then $b\in S$.
Dec 8, 2009 at 9:17 vote accept Adam
Dec 7, 2009 at 22:07 answer added Mikael Vejdemo-Johansson timeline score: 0
Dec 7, 2009 at 8:47 answer added David Eppstein timeline score: 11
Dec 7, 2009 at 8:37 history asked Adam CC BY-SA 2.5