Besides the Schrödinger and Heisenberg pictures, there is a third picture in quantum mechanics. This is a time evolution of states and operators were both objects have time dependence. This time dependence is use for interaction processes and the like. With this time dependence one can find an object that givesinformationo on interactions, and given an initial state that object can give you the possible outcomes and probabilities. This object is called the S-Matrix.
Today I got to talked about this in my class. I felt better prepared than the time I talked about Plane Wave Solutions to the Dirac Equation. It was pretty awesome.
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