Ok, I'll give my best shot at what happens when you get a Ph.D. in math. They take you to a secret room and give you equations that solve all nonlinear problems and tell you to keep them secret else we'll all be out of a job.
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Replying to @mathematicsprof
Tata lectures on Theta: it's not really a secret that there are closed form solutions for a fair number of nonlinear problems, it just requires being a studious reader and following references. (that having been said 'nonlinear' is nonequivalent to 'positive lyapunov exponents')
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Replying to @graveolens @mathematicsprof
Also: Exactly Solvable and Integrable Systems https://arxiv.org/list/nlin.SI/recent … https://en.m.wikipedia.org/wiki/Integrable_system#Exactly_solvable_models …
11:30 AM - 3 Dec 2019
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