> Any ideas on the 3rd person aspect? > Are you assuming that that commutability > or non-commutativity of observables > is fixed a priori? > Stephen
There are problems about consistency between measurements on the same system http://www.arxiv.org/abs/quant-ph/0107151 and related commutativity/non commutativity between density matrices. More than this, our usual assumption that the result of the measurement of a certain operator A depends _only_ on the state of the quantum system we are measuring, and nothing else, is flawed ((in general, not when the state of the quantum system is an eigenstate of the operator A). There is contextuality. Saluti, s.
