Theodorus of Cyrene

Theodorus of Cyrene was an Greek mathematician of the 5th century BC who was admired by Plato, who mentions him in several sources. Little is known about his accomplishments; however, he is atrributed to proving that the square roots of the integer numbers between 3 and 17 except the square numbers 4, 9 and 16 , i.e. 3, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15 and 17 are irrational (the case for n = 2 was well-known before him).

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From Plato's Theaetetus to Gauss's Pentagramma Mirificum: A Fight for Truth (PDF) by Bruce Director






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