[Merged by Bors] - feat(analysis/calculus/times_cont_diff): iterated smoothness in terms of deriv #4017
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… of deriv (#4017) Currently, iterated smoothness is only formulated in terms of the Fréchet derivative. For one-dimensional functions, it is more handy to use the one-dimensional derivative `deriv`. This PR provides a basic interface in this direction.
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… of deriv (#4017) Currently, iterated smoothness is only formulated in terms of the Fréchet derivative. For one-dimensional functions, it is more handy to use the one-dimensional derivative `deriv`. This PR provides a basic interface in this direction.
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Currently, iterated smoothness is only formulated in terms of the Fréchet derivative. For one-dimensional functions, it is more handy to use the one-dimensional derivative
deriv. This PR provides a basic interface in this direction.Requested on Zulip in https://leanprover.zulipchat.com/#narrow/stream/113489-new-members/topic/Generalized.20Rolle.20theorem/near/205904055