Lagrange's four-square theorem

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Science and technology

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What Wikipedia says

Lagrange's four-square theorem, also known as Bachet's conjecture, states that every nonnegative integer can be represented as a sum of four non-negative integer squares. That is, the squares form an additive basis of order four:

Excerpt from the Wikipedia article “Lagrange's four-square theorem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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