About ab initio

[saurish]

Quantum physics provides us an ab initio approach where we can write (and, in principle, solve) the Schrodinger equation for our system and can obtain the spatio-temporal variation in the wave function given certain initial and boundary conditions.
Classical physics also has Newton’s laws for the same purpose.
Classical electromagnetism (Maxwell’s equations) can give us an ab initio description of the variation of electric and magnetic fields. The difference of this with the above two areas is that this is based on fields and the previous two are built from single particle descriptions. Promoting them to Quantum/Classical Theory of Fields may narrow this apparent gap.

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