Talk:Euler's four-square identity

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Mathematics rating:
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 Field: Number theory

Quaternion multiplication[edit]

I modified the specific 4-square identity so that it has an all plus term; it now corresponds to the quaternion multiplication b \bar a,, rather than the former b a. If someone wants to change it to a \bar b, I have no objection, but it seems important to me that one term is \left(a_1 b_1 + a_2 b_2 + a_3 b_3 + a_4 b_4\right) ^2.Arthur Rubin (talk) 02:45, 2 July 2014 (UTC)