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]
[edit] See also
[edit] References
- ^ Dimitra Karamanides (2005), Pythagoras: pioneering mathematician and musical theorist of Ancient Greece, The Rosen Publishing Group, pp. 65-65, http://books.google.co.uk/books?id=DQpSA4CEnIwC
