Where to start from

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    Quantum physics is an ab initio model because it starts from the Schrödinger equation, which itself is the answer to the deBroglie wavelength. I guess the point is that we consider particles to act as waves that can be described in complex space. I suppose also that the Dirac equation would be a different starting space if we wanted to consider spin as well, making quantum physics ab initio from different starting positions.
    Classical mechanics is also ab initio, starting from Newton’s Laws, just as classic electrodynamics starts from the set of equations known as Maxwell’s equations, with no satisfying justification for the speed of light in a vacuum.

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