5
General Formalism
Quantum mechanics is radically different from classical physics. It cannot be derived from classical physics. The description of the state, the rules to calculate a physical quantity and the interpretations in quantum mechanics are absolutely different from classical physics. One has to start the study of quantum mechanics with the study of set of postulates, based on which the whole quantum mechanics is developed. The validity of these postulates lies in the experimental verification of the results deduced from these postulates. In this respect, quantum mechanics is an extraordinarily successful theory. Postulatory approach to a subject is not new to physics. All the branches of physics have to start with a set of few basic ...
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