Post by Emmanuel Jesuyon Dansu (@ejdansu)

Inspiring Mathematicians 105: Theaetetus of Athens

Theaetetus of Athens (c. 417–369 BCE) was an ancient Greek mathematician whose work made important contributions to the development of geometry and the study of irrational magnitudes.

A student of Theodorus of Cyrene and an associate of Plato’s intellectual circle, he helped advance the classification of incommensurable quantities and the mathematical understanding of irrational numbers.

His contributions are closely associated with the theory of regular solids, including the systematic study of the five convex regular polyhedra, later presented in Euclid’s Elements.

Plato honored him by making him the central figure in the dialogue Theaetetus, which explores the nature of knowledge.

Through his work on geometry and mathematical abstraction, Theaetetus helped strengthen the foundations of rigorous mathematical reasoning in ancient Greece.

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