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People often claim on Physics Forums and in the foundations community proper that quantum mechanics is “incomplete.” Indeed, Lee Smolin recently wrote [1, p. xvii]:
I hope to convince you that the conceptual problems and raging disagreements that have bedeviled quantum mechanics since its inception are unsolved and unsolvable, for the simple reason that the theory is wrong. It is highly successful, but incomplete.
What motivated Smolin to make this claim is the same reason that Einstein thought quantum mechanics was incomplete, i.e., quantum mechanics doesn’t provide values for unmeasured observables, which is called “no counterfactual definiteness” (see this Insight on Zeilinger’s delayed choice experiment and Hardy’s device or this...
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