Pythagoreanism
The doctrines (philosophical, mathematical, moral, and religious) of Pythagoras (c. 572-497) and of his school which flourished until about the end of the 4th century B.C. The Pythagorean philosophy was a dualism which sharply distinguished thought and the senses, the soul and the body, the mathematical forms of things and their perceptible appearances. The Pythagoreans supposed that the substances of all things were numbers and that all phenomena were sensuous expressions of mathematical ratios. For them the whole universe was harmony. They made important contributions to mathematics, astronomv, and physics (acoustics) and were the first to formulate the elementary principles and methods of arithmetic and geometry as taught in the first books of Euclid. But the Pythagorean sect was not only a philosophical and mathematical school (cf. K. von Fritz, Pythagorean Politics in Southern Italy, 1941), but also a religious brotherhood and a fellowship for moral reformation. They believed in the immortality and transmigration (see Metempsychosis) of the soul which they defined as the harmony of the body. To restore harmony which was confused by the senses was the goal of their Ethics and Politics. The religious ideas were closely related to those of the Greek mysteries which sought by various rites and abstinences to purify and redeem the soul. The attempt to combine this mysticism with their mathematical philosophy, led the Pythagoreans to the development of an intricate and somewhat fantastic symbolism which collected correspondences between numbers and things and for example identified the antithesis of odd and even with that of form and matter, the number 1 with reason, 2 with the soul, etc. Through their ideas the Pythagoreans had considerable effect on the development of Plato’s thought and on the theories of the later Neo-platonists.
Bibliography
John Burnet,
Early Greek Philosophy, 3rd ed. (1920).
E. Zeller-R. Mondolfo,
La Filosofia dei Greci, vol. I (1932-1938).
E. Frank,
Plato und die sogenannten Pythagoreer (1923).
T. L Heath,
A History of Greek Mathematics, vol. I (1921).
— E.F.