Theodorus

Theodorus of Cyrene

Born: 465 BC in Cyrene (now Shahhat, Libya)
Died: 398 BC in Cyrene (now Shahhat, Libya)

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Theodorus was a tutor of Plato and Theaetetus and is best remembered by mathematicians for his contribution to the development of irrational numbers.

Theodorus was also one of the main philosophers in the Cyrenaic school of moral philosophy. He believed that pleasures and pains are neither good nor bad. Cheerfulness and wisdom, he believed, were sufficient for happiness.

References:

  1. Dictionary of Scientific Biography
  2. T L Heath, A History of Greek Mathematics I (Oxford, 1921), 203-204, 209-212.
  3. M S Brown, Theaetetus : Knowledge as Continued Learning, Journal of the History of Philosophy 7 (1969), 359-379.
  4. A Wasserstein, Theaetetus and the History of the Theory of Numbers, Classical Quarterly 8 (1958), 165-179.
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JOC/EFR February 1996