Euler's four-square identity - Wikipedia
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Lagrange's four-square theorem - Wikipedia
Degen's Eight-square Identity
Prove that Euler's four-square identity, Pfister's identity, Degen's eight-square identity
Fractal Fract, Free Full-Text
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Degen's eight-square identity - Wikipedia
I just disproved pythagorean theorem!!! It's false for 4,5,6 : r/mathmemes
Euler's four-square identity - Wikipedia
Hyperbolic Trigonometric Functions
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