Greek Ionian Pre-Socratic philosopher (c.586–c.526 BC)
Anaximenes of Miletus (c. 585 – c. 528 BC) was a Greek Pre-Socratic philosopher from the city of Miletus in Caria. He was reportedly a pupil of Anaximander, who himself followed the teachings of Thales in the Monist school of thought. Anaximenes is known for proposing air as the element from which all substances emanate (the material principle), for asserting that the universe is in constant motion, and for theorizing that the forms of matter change based on their rarity or density.
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