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10 Cards in this Set

  • Front
  • Back
Thales
held that the basic stuff out of which all else is composed is water
Anaximander
held that the original source of all things is a boundless, indeterminate element.
Anaximenes
said that the underlying principle of all things is air.
Pythagoras
maintained that enumerability constitutes the true nature of things.
Heraclitus
held that the only reality is ceaseless change and the underlying substance of the universe is fire.
Parmenides
said that the only reality is permanent, unchanging, indivisible, and undifferentiated being and that changes and motion are illusions of the senses
Zeno
divised clever paradoxes seeming to show that motion is impossible.
Empedocles
held that apparent changes in things are in fact in the positions of basic particles, of which there are four types: earth, air, fire, and water. Two forces cause these basic changes: love and strife.
Anaxagoras
mantained that all things are composed of infinitely divisible particles; the universe was caused by mind (nous) acting on matter.
The Atomists
(especially Leucippus and Democritus) said that all things are composed of imperceptible, indestructible, indivisible, eternal and uncreated atoms. Motion needs no explanation.