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Hurwitz-Radon Theorem


Determined the possible values of r and n for which there is an identity of the form

 (x_1^2+...+x_r^2)(y_1^2+...+y_r^2)=z_1^2+...+z_n^2.

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Cite this as:

Weisstein, Eric W. "Hurwitz-Radon Theorem." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Hurwitz-RadonTheorem.html

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