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Irrationality of √2

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Came across this interesting piece of Maths History.

The discovery of the irrationality of √2 is sometimes credited to Hippasus of Metapontum (5th century BC), a Greek Pythagorean philosopher who was finally drowned at sea as a punishment from his peers, the Pythagoreans, for divulging the existence of the irrational numbers (the Pythagoreans advocate the idea that all numbers SHOULD be the ratio of two integers.