Theodorus of Cyrene

Theodorus of Cyrene in Wikipedia

Theodorus of Cyrene (Greek: Θεόδωρος ὁ Κυρήνη) was a Greek mathematician of the 5th century BC. The only first-hand accounts of him that we have are in two of Plato's dialogues: the Theaetetus and the Sophist. In the former, his student Theaetetus attributes to him the theorem that the square roots of the non-square numbers up to 17 are irrational:...

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Theodōrus in Harpers Dictionary of Classical Antiquities (1898)

A philosopher of the Cyrenaic School, usually designated by ancient writers "the Atheist." He resided for some time at Athens; and being banished thence, went to Alexandria, where he entered the service of Ptolemy, son of Lagus....

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