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Dear all, I'm searching for a question asked some time ago on mse. It was about the proof of something like the following statement: take a subset S of the unit square of area >1/2. Then S contains the vertices of a right angle triangle. There was a nice answer using integration, though I can't remember who posted it.

I've tried tag search using the mse search box, and a google search, to no avail. Can anyone remember any more about the question?

NB it's possible I have the wrong site, and this was posted on mathoverflow - but I don't think so.

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It was on MO. https://mathoverflow.net/questions/56623/a-puzzle-about-finding-three-points-x-y-x-z-and-y-z-in-a-subset-of-a/

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  • $\begingroup$ many thanks! ___ $\endgroup$ – Matthew Towers Apr 19 '11 at 15:04

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