Lagrange's Four Square Theorem
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Chit-chat on Lagrange's four-square theorem

Solved Lagrange's four square theorem says every natural

Answered: The Modular Operation r mod m = r…
Waring's Problem -- from Wolfram MathWorld
Lagrange's three square theorem
Jacobi's four-square theorem - Wikipedia

Waring's Problem & Lagrange's Four-Square Theorem
Waring's Problem -- from Wolfram MathWorld

Lagrange's Four-Square Theorem Seen Using Polygons and Lines

Five ideas for square numbers

Jacobi's four-square theorem

Modular arithmetic before C.F. Gauss: Systematizations and discussions on remainder problems in 18th-century Germany
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