On procedures for the measurement of questions in quantum mechanics
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It is shown that there exist observablesA and Borel setsE such that the procedure “measureA and give as output the number 1 (0) if theA measurement outcome is (is not) inE” does not correspond to a measurement of the proposition observable ℰA(E) usually assigned to such procedures. This result is discussed in terms of limitations on choice powers of observers.
KeywordsQuantum Mechanic theA Measurement Choice Power
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