Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2023-04-25 23:03 f0b3759a

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chore(set_theory/zfc/basic): reverse sInter_coe (#18773) It now matches coe_sUnion, and works as a norm_cast lemma. Mathlib 4: https://github.com/leanprover-community/mathlib4/pull/3345

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