Anaximenes of Miletus
Greek Ionian Pre-Socratic philosopher (c.586–c.526 BC)
Anaximenes of Miletus (; Ancient Greek: Ἀναξιμένης ὁ Μιλήσιος, romanized: Anaximenēs ho Milēsios; c. 586/585 – c. 526/525 BC) was a pre-Socratic Greek philosopher from Miletus in Anatolia (modern-day Turkey). He was the last of the three philosophers of the Milesian School, after Thales and Anaximander. These three are regarded by historians as the first philosophers of the Western world. Little is known of Anaximenes's life and work, as all of his original texts are lost. Historians and philosophers have reconstructed information about Anaximenes by interpreting texts about him by later writers.
Anaximenes is known for his belief that air is the arche, or the basic element of the universe from which all things are created. All three Milesian philosophers were monists who believed in a single foundational source of everything: Anaximenes believed it to be air, while Thales believed it to be water and Anaximander believed it to be apeiron, an undefined infinity. It is generally accepted that Anaximenes was instructed by Anaximander, and many of their philosophical ideas are similar. While Anaximenes was the preeminent Milesian philosopher in Ancient Greece, he is often given lower importance than the others in the modern day.
Anaximenes held that air could change into other forms through either rarefaction or condensation.
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