Ciro Santilli
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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.
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Let's gather some of the best results we come across here:
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Ancestors

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