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edited Feb 17, 2021 at 4:25

Is there a general solution for this differential equation? f''(x) = f(f(x))

I'm currently an undergraduate studying differential equations and I've been fixated on this differential equation for the past 2 days. I can't seem to crack it but it feels like it should have a general solution?

differential-equations functional-equations

asked Feb 17, 2021 at 3:06

Trevor Krumrine