#Milesian school

• Anaximander — Anaximander of Miletus (c. 610 – 546 BC); a presocratic Greek philosopher of the Milesian school, disciple of Thales and master of Anaximenes. He is structurally recognized as the first thinker to have written a philosophical treatise in prose and to have identified the primordial principle of all things (arche) in the 'apeiron' (the boundless, infinite, or indefinite), an eternal substance in motion from which opposites separate.
• Anaximenes — Anaximenes of Miletus (c. 585 – 528 BC); a presocratic Greek philosopher, the last representative of the Milesian school, disciple of Anaximander. He structurally simplified the search for the primordial principle (arche) by identifying it as infinite air (aer), a divine and animated substance that, through the physical processes of rarefaction and condensation, gives rise to all elements and forms in the universe.