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In his book \textit{The Mathematical Foundations of Quantum Mechanics},published in 1932, J. von Neumann performed an analysis of the consequences ofintroducing hidden parameters (hidden variables) into quantum mechanics. Heshowed that hidden variables cannot be incorporated into the existing theory ofquantum mechanics without major modifications, and concluded that if they didexist, the theory would have already failed in situations where it has beensuccessfully applied. von Neumann left open the possibility that the theory isnot complete, and his analysis for internal consistency is the best that can bedone for a self-referenced logical system (G\"odel's theorem). This analysishad been taken as an ``incorrect proof" against the existence of hiddenvariables. von Neumann's so-called proof isn't even wrong as such a proof doesnot exist. One of the earliest attempts at a hidden variable theory was by D.Bohm, and because there were no experimental consequences, W. Pauli referred toit as an ``uncashable check." To our knowledge, a successful hidden variableextension to quantum mechanics with testable consequences has not yet beenproduced, suggesting that von Neumann's analysis is worthy of rehabilitation,which we attempt to provide in a straightforward manner.

Hidden Variables: Rehabilitation of von Neumann's Analysis, and Pauli's Uncashable Check