Euclid Writes The Elements

Euclid of Alexandria (Εὐκλείδης), active around 300 BCE, was a Greek mathematician often called the "Father of Geometry." His masterwork, The Elements, systematically organized the mathematical knowledge of his time into 13 books. It introduced Euclidean geometry, defined five fundamental axioms, and contained rigorous proofs in geometry and number theory — including the proof that there are infinitely many prime numbers. The Elements remained a standard mathematics textbook for over two thousand years and is one of the most influential books ever published.