Google today on August 17, celebrating Pierre de Fermat's birthday with a special doodle.

"Pierre de Fermat (17 August 1601 or 1607/8 - 12 January 1665) was a French lawyer at the Parlement of Toulouse, France, and an amateur mathematician who is given credit for early developments that led to infinitesimal calculus, including his adequality.

In particular, he is recognized for his discovery of an original method of finding the greatest and the smallest ordinates of curved lines, which is analogous to that of the then unknown differential calculus, as well as his research into number theory.

He made notable contributions to analytic geometry, probability, and optics. He is best known for Fermat's Last Theorem, which he described in a note at the margin of a copy of Diophantus' Arithmetica," Wikipedia.

"I have discovered a truly remarkable proof but this margin is too small to contain it," Pierre de Fermat famously wrote on margin of his copy of the Arithmetica by Diophantus of Alexandria back in 1637. The proof the French mathematician and lawyer was referring to was for his theorem in which he states that no three positive integers x, y, and z can satisfy the equation x^{n} + y^{n} = z^{n} where n is an integer greater than two.

Fermat's Last Theorem, also called Fermat's great theorem, was his best known work and to commemorate the 410th birth anniversary of the founder of the modern theory of numbers Google has put up a doodle inspired by the theorem. Instead of a copy of the Arithmetica, the Google doodle uses a blackboard with a faintly erased Google logo and the theorem written in chalk.