We are discussing the Demystifier's paper "Quantum mechanics: myths and facts". http://xxx.lanl.gov/abs/quant-ph/0609163 Previously: Myth 1 https://www.physicsforums.com/showthread.php?t=229497 Myth 2 https://www.physicsforums.com/showthread.php?t=230693 Myth 3 https://www.physicsforums.com/showthread.php?t=232102 QM implies that there is no reality besides the measured reality The topic here is that the claim "QM implies that there is no reality besides the measured reality" is itself a myth. By myths we mean widely repeated statements which, true or false, are not something we can validly assert given our current understanding. My first reaction to the topic statement is that it would be exceedingly difficult to define. However, I think what is meant here is that the results of QM imply there are no hidden variables: quantifiable aspects of physical reality which (within the formulation of QM) are unobservable but whose values influence observable quantities. My first question has to do with the transition from section 5.2 to 5.3 & 5.4. In 5.2 we are definitely talking about a classical quantity s. All along 5.3 it seems we continue to talk about the same classical system but in a quantum-like formulation. Then in section 5.4 right after eq 40 we find the sentence, "The fact is that if this were the case, then it would contradict the predictions of QM!" Did we pass from classical to quantum somewhere along the way?