The tetrad or number four is the first number formed by the addition and multiplication of equals. To the Pythagoreans, this symbol and number represented justice as it is the first number that is divisible every way into equal parts.[1]
See also
References
- ^ Hemenway, Priya. Divine Proportion: Phi In Art, Nature, and Science. Sterling Publishing Company Inc., 2005. ISBN 1-4027-3522-7, p. 55
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