Text: Everett's many-worlds interpretation (MWI) of quantum mechanics is literal and real, albeit the additional worlds are to be taken as virtual to the laboratory observer. For an exposition of Everett's MWI, see Hugh Everett III, The Many-World Interpretation of Quantum Mechanics. A Fundamental Exposition, with papers by J. A. Wheeler, B. S. DeWitt, L. N. Cooper and D. Van Vechten and N. Graham; eds. Bryce S. Dewitt and Neill Graham, Princeton Series in Physics, Princeton University Press, 1973.

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