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Apr 14, 2015 at 16:26 history edited James Cranch CC BY-SA 3.0
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Apr 14, 2015 at 16:21 comment added Emil Jeřábek That’s not a serious obstackle: math.stackexchange.com/questions/852567
Apr 14, 2015 at 16:13 comment added James Cranch Ah, thanks. I've just discovered you can't downvote your own answer.
Apr 14, 2015 at 15:56 comment added Clark Kimberling In the four squares theorem, the squares need not be distinct.
Apr 14, 2015 at 15:53 history answered James Cranch CC BY-SA 3.0