Lagrange's Four-Square Theorem, PDF, Number Theory
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PDF) Two refinements of Lagrange's four-square theorem
MathType - Lagrange's four-square theorem states that every natural number can be represented as the sum of four integer squares. Proved by Joseph Louis #Lagrange in 1770, it can be regarded as
Number Theory: How can I construct an integer's representation as a sum of four squares? - Quora
PDF) Some variants of Lagrange's four squares theorem
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