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For Milesian philosophers Thales (c. 626/623—c. 548/545 BC), Anaximander (c. 610—c. 546 BC), and Anaximenes (c. 586/585—c. 526/525 BC) there was an ultimate principle they called arche. For Thales, this ultimate principle from which everything originated was water; for Anaximenes, it was air; and for Anaximander, it was Apeiron (limitless), whereas, for the Pythagoreans, the number was the ultimate principle.
For Heraclitus (c. 540—c. 480), arche was fire from which everything originated, but L
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If there is a change, there must be some thing that changes, yet does not change
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