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In Greek philosophy, the apeiron (meaning "unlimited," "infinite," or "indefinite") was proposed by Anaximander as the primal principle from which all things originate. Unlike earlier philosophers who suggested a specific element like water as the origin, Anaximander posited the apeiron as an indeterminate substance without specific qualities.123

From this boundless source, opposing forces like hot and cold emerged, leading to the formation of the cosmos. Anaximander's concept was a foundational step in developing a systematic, naturalistic explanation of the world, moving away from mythological accounts.243

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