Lagrange's Four-Square Theorem -- from Wolfram MathWorld
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A theorem, also known as Bachet
Waring's Problem & Lagrange's Four-Square Theorem
Lagrange's four-square theorem - Wikipedia
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Lagrange's Four Squares Theorem
Sum of Squares Function -- from Wolfram MathWorld
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Sum of Squares Function -- from Wolfram MathWorld
Waring's Problem -- from Wolfram MathWorld