Lagrange's four-square theorem - Wikipedia
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Lagrange's four-square theorem - Wikipedia

Lagrange polynomial - Wikipedia

Mean value theorem - Wikipedia

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Are there any numbers which cannot be written as a sum of three cubes or sums of four squares? If yes, then how many such numbers exist and what are they?
Lagrange's Four-Square Theorem, PDF, Number Theory

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Solved In Number Theory, Lagrange's four-square theorem

SOLVED: 8.35 (Lagrange's Four-Square Theorem) If n is a natural number, it can be expressed as the sum of four squares. A lattice in 4-space is a set of the form (x,y,z,w)
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Lagrange's Four-Square Theorem Seen Using Polygons and Lines

PDF) Two refinements of Lagrange's four-square theorem
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