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Feb 24, 2016 at 20:16 comment added LSpice A trivial comment on this very nice answer: a field for which the sum of two squares is a square is called Pythagorean.
Jan 12, 2013 at 9:57 history edited KConrad CC BY-SA 3.0
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Jan 12, 2013 at 7:29 history edited Will Sawin CC BY-SA 3.0
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Jan 11, 2013 at 23:01 history answered Will Sawin CC BY-SA 3.0