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What is decoherence?”) The worlds all exist simultaneously in a non-

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What is decoherence?”) The worlds all exist simultaneously in a non-

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interacting linear superposition. Sometimes “worlds” are called “universes”, but more usually the latter is reserved the totality of worlds implied by the universal wavefunction. Sometimes the term “history” is used instead of “world”. (Gell-Mann/Hartle’s phrase, see “What is many-histories?”).

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