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=== von Neumann's proof ===
In a [[Mathematical Foundations of Quantum Mechanics|1932 textbook]] [[John von Neumann]] had presented a proof that there could be no "hidden parameters", but the validity of von Neumann's proof was questioned by [[Grete Hermann]]<ref>Hermann, G.: Die naturphilosophischen Grundlagen der Quantenmechanik (Auszug). Abhandlungen
der Fries’schen Schule 6, 75–152 (1935). English translation: Chapter 15 of “Grete Hermann —
Between physics and philosophy”, Elise Crull and Guido Bacciagaluppi, eds., Springer, 2016, 239-
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