Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-11-02 20:27 5334f48b

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chore(data/fintype/card): add a few lemmas (#4877) Prove a few versions of (∏ i in s, f i) * (∏ i in sᶜ, f i) = ∏ i, f i

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