Chaos

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Asymmetrical symbol of Chaos
Asymmetrical symbol of Chaos

Chaos (derived from the Greek Χάος, Chaos) typically refers to unpredictability, and is the antithetical concept of cosmos. The word χάος did not mean "disorder" in classical-period ancient Greece. It meant "the primal emptiness, space" (see Chaos (mythology)). Chaos is derived from the Proto-Indo-European root ghn or ghen meaning "gape, be wide open": compare "chasm" (from Greek χάσμα), and Anglo-Saxon gānian ("yawn"), geanian, ginian ("gape wide"); see also Old Norse Ginnungagap. Due to people misunderstanding early Christian uses of the word, the meaning of the word changed to "disorder". (The Ancient Greek for "disorder" is ταραχή.). Mathematically, chaos means an aperiodic deterministic behavior which is very sensitive to its initial conditions, i.e., infinitesimal perturbations of boundary conditions for a chaotic dynamic system originate finite variations of the orbit in the phase space; see chaos theory.

Main article: Chaos (physics)

Chaos in physics is often considered analogous to thermodynamic entropy.

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