The three papers presented below address key issues of the so-called Copenhagen Interpretation (CI) of quantum mechanics (QM). The Copenhagen school accepts the probabilistic model, the principle of nonlocality and the duality of quantum particles. On the other hand, physicists of the EPR (Einstein-Podolsky-Rosen) school regard QI as an incomplete theory. It is through the experiments described in these papers that one can prove which of the two schools gives the correct description of quantum mechanics. It should be noted that the three articles are logically related, but each can also be considered independently.
