Categories: Disambiguation Pierre de Fermat Fermats last theorem (sometimes abbreviated as FLT and also called Fermats great theorem) is one of the most famous theorems in the history of mathematics. ... Fermats little theorem states that if p is a prime number, then for any integer a, This means that if you take some number a, multiply it by itself p times and subtract a, the result is divisible by p (see modular arithmetic). ... Pierre de Fermats theorem on sums of two squares states that an odd prime is expressible as with and integers if and only if Fermat announced this theorem in a letter to Mersenne dated December 25, 1640; for this reason this theorem is sometimes called Proofs of Fermats...