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Dec 15, 2013 at 22:58 comment added Will Jagy so as not to bump: my computer says that not one of the 64 signed permutations of $6 + i + j + k$ is the sum of two squares of Hurwitz quaternions.
Dec 8, 2013 at 22:34 history edited Will Jagy CC BY-SA 3.0
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Dec 8, 2013 at 21:11 history edited Will Jagy CC BY-SA 3.0
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Dec 8, 2013 at 7:02 history answered Will Jagy CC BY-SA 3.0