"Nonlinear" doesn't mean "curved." It means "everything else left after you take out the linear". That's a huge inifinity of possibilities.
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Replying to @vgr
...90% of the time when people say "nonlinear" in everyday use, they seem to mean specifically either "exponential" or "non-sequential"...
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...this is actually pretty rational, since those are nonlinearities that cannot even be usefully bounded between linear approximations 
9:14 AM - 18 Mar 2017
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