Democritus
Mathematics

Democritus was also a pioneer of mathematics and geometry in particular. According to Archimedes, Democritus was among the first to observe that a cone and pyramid with the same base area and height has one-third the volume of a cylinder or prism respectively, a result which Archimedes states was later proved by Eudoxus of Cnidus. Plutarch also reports that Democritus worked on a problem involving the cross-section of a cone that Thomas Heath suggests may be an early version of infinitesimal calculus.
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