Lagrange's Four Square Theorem
Por um escritor misterioso
Descrição
Problem 3. Let ( r _ { 4 } ( n ) ) be the number of ways you can write ( n ) as of four squares of non-negative integers. It's
The Method of Lagrange Multipliers, by Panda the Red
Five ideas for square numbers
Number Theory: How can I construct an integer's representation as a sum of four squares? - Quora
Table 3 from Extended Lagrange's four-square theorem
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Lagrange's four-square theorem - Wikipedia
PDF) Lagrange's Four-Square Theorem
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