Ab initio

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    Dox1997
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    Quantum physics is an Ab-initio model because it describes all the interactions between atoms and molecules. On the contrary, Classical mechanics is ab-initio if only macroscopic objects are considered. I think that classical electromagnetism can be considered an ab-initio theory if low frequencies are involved, if not it is necessary to introduce photons and then QED, that is the real first principle physics about electromagnetism.

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