Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-08-18 17:58 f651d75e

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chore(data/polynomial/derivative): merge iterated_deriv.lean into derivative.lean (#16022) iterated_deriv.lean was not used anywhere, and derivative.lean already had independent variants of several of the lemmas there, without the iterated_deriv indirecion. It seems better to consolidate these results.

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