They are the ones that preceded Socrates, the first of the Triumvirate of Western Philosophy, and led the formative era of philosophy. Pre-Socratics true Post-Socratics false Post-Pythagorean false false 0 Single 0 He believed in the universal flux, i.e. everything is constantly changing, and in unity of opposites. Aristotle false Heraclitus true Democritus false false 0 Single 0 He was the proponent of the atomic theory of the universe. Aristotle false Heraclitus false Democritus true false 0 Single 0 He concluded that water makes up everything. Thales true Laritus false Pittacus false false 0 Single 0 It is also known as the originating principle. archê true télos false mesaíou false false 0 Single 0 Greek word meaning "(that which is) unlimited," "boundless", "infinite", or "indefinite". periorisménos false apeiron true ório false false 0 Single 0 He believed that everything was air. Xenophanes false Anaxagoras false Anaximenes true false 0 Single 0 Pythagoreans believes that this has to be attained in both music and medicine. harmony true dissonance false incongruity false false 0 Single 0 According to Heraclitus, it is the force that unites all. Gravity false Word/Logos true Magnetic Force false false 0 Single 0 These are the basic units of matter and the defining structure of elements. Quart false Molecules false Atoms true false 0 Single 0