perturbation-theory

= Perturbation theory
{wiki}

Used a lot in <quantum mechanics>, where the equations are really hard to solve. There's even a dedicated wiki page for it: https://en.wikipedia.org/wiki/Perturbation_theory_(quantum_mechanics)[]. Notably, <Feynman diagrams> are a way to represent perturbation calculations in <quantum field theory>.

Let's gather some of the best results we come across here:
* <Dirac equation solution for the hydrogen atom>

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