== Statement about conjugate variables needs attention == 

 In section "Mathematical formulation", we have: "Contrary to classical mechanics, one can never make simultaneous predictions of conjugate variables, such as position and momentum, with accuracy. For instance, electrons may be considered (to a certain probability) to be located somewhere within a given region of space, but with their exact positions unknown" 

 1. In classical mechanics we have conjugate variables such as the time course and frequency of a signal in which precision must be traded off between the two. So the statement here is not exactly "contrary to classical mechanics". 

 2. The second sentence purports to illustrate the first, so should presumably involve two variables, but then discusses only one: position.