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1. The problem statement, all variables and given/known data

I have read several chapters of De Brogile's article "the theory of quanta".The motion of a particle could be analogious to a ray in general optics.This is an analogy between Maupertui's principle and fermat's principle.

How to use this theory to derive Schordinger equation?

How to explain the electron diffraction through fermat's principle?

2. Relevant equations

No equations.

3. The attempt at a solution

No ideas sorry

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# I How Fermat's principle interprets diffraction and interference

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