Tetrad (Greek philosophy)

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The tetrad was the name given to the number four in Pythagorean philosophy. There were four seasons and four elements, and the number was also associated with planetary motions and music.[1]

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References[edit]

  1. ^ Dimitra Karamanides (2005), Pythagoras: pioneering mathematician and musical theorist of Ancient Greece, The Rosen Publishing Group, pp. 65–65