Person
Theodorus of Cyrene
Theodorus of Cyrene was a Greek mathematician of the 5th century BCE, a teacher of Plato and of Theaetetus. In Plato's dialogue Theaetetus he is credited with showing that the square roots of the non-square numbers from 3 to 17 are irrational. He is among the earliest known contributors to the theory of incommensurable magnitudes.
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- APA
- The Epoch Institute. (2026). Theodorus of Cyrene. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/theodorus-of-cyrene
- MLA
- “Theodorus of Cyrene.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/theodorus-of-cyrene. Accessed .
- Chicago
- The Epoch Institute. “Theodorus of Cyrene.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/theodorus-of-cyrene.
- Harvard
- The Epoch Institute (2026) ‘Theodorus of Cyrene’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/theodorus-of-cyrene (Accessed: ).
Last reviewed October 2026Random entry ↻