Lagrange's Four Square Theorem/Also known as

Lagrange's Four Square Theorem: Also known as

Some sources use the plural form for Lagrange's Four Square Theorem , as Lagrange's Four Squares Theorem.

Some omit Lagrange's name, and refer to this as just the Four Squares Theorem.

Some sources refer to this as just Lagrange's Theorem, but this is ambiguous as there is more than one theorem with Lagrange's name on it.

Sources

• 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): four squares theorem
• 1992: George F. Simmons: Calculus Gems ... (previous) ... (next): Chapter $\text {B}.2$: More about Numbers: Irrationals, Perfect Numbers and Mersenne Primes
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): four squares theorem
• 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): four squares theorem
• 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): Lagrange's Theorem (sum of four squares)