Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-05-20 19:37 a540d79b

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chore(archive/sensitivity): Clean up function coercion in sensitivity proof (depends on #2756) (#2758) This formalizes the proof of an old conjecture: is_awesome Gabriel. I also took the opportunity to remove type class struggling, which I think is related to the proof of is_awesome Floris. I think @jcommelin should also update this sensitivity file to use his sum notations if applicable.

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