Fermat's Two Squares Theorem/Also known as

Fermat's Two Squares Theorem: Also known as

Fermat's Two Squares Theorem is also known as just the Two Squares Theorem.

It is also known as Fermat's Christmas Theorem on account of the date on it.

Sources

• 1992: George F. Simmons: Calculus Gems ... (previous) ... (next): Chapter $\text {B}.2$: More about Numbers: Irrationals, Perfect Numbers and Mersenne Primes