The first important mathematician associated with Alexandria was *Euclid* (c.250 BC), who wrote on optics and conics, but is mainly remembered for his *Elements*. The most influential and widely read mathematical book of all time, the *Elements* is a compilation of results known at the time, and consists of thirteen books on plane and solid geometry, number theory, and the theory of proportion. A model of deductive reasoning, it builds from initial axioms and postulates, using rules of deduction to derive each new proposition in a logical and systematic order.

*[Maldive Islands 1988; Sierra Leone 1983]*