Anaximenes of Miletus (l. c. 546 BCE) was a younger contemporary of Anaximander and generally regarded as his student. Known as the Third Philosopher of the Milesian School after Thales (l. c. 585 BCE) and Anaximander (l. c. 610 - c. 546 BCE), Anaximenes proposed air as the First Cause from which all else comes.
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c. 546 BCEDate of Anaximenes' work; air is claimed as the First Cause of existence.