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Ciro Santilli @cirosantilli 37

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 Incoming links: Lagrange's four-square theorem

Waring's problem for squares Updated 2025-10-14
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4 squares are sufficient by Lagrange's four-square theorem.
3 is not enough by Legendre's three-square theorem.
The subsets reachable with 2 and 3 squares are fully characterized by Legendre's three-square theorem.
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