Ab initio model

[sosafi]

Why do we call quantum physics an ab initio model? Why do we call classical mechanics an ab initio model? Is classical electromagnetism an an ab initio model (and if it is one, what are its first principles)?

An ab initio model is a model that cannot be further reduced to more fundamentals models in that sense quantum physics and classical mechanics can be considered an ab initio model because we cannot reduce the Schrondinger equation and Newton equation to a more fundamental equation. In principle classical mechanics can be deduced from quantum mechanics but the model will need some many partucles that will not make sense to do it
I consider classical electromagnetism an ab inito model because all the physic can be written using Maxwell equations, however I don’t know if it is possible to deduce this equation somehow from the quantum electrodynamics

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