Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-07-31 20:14 9bb1256d

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feat(order/succ_pred/basic): a ≤ succ ⊥ ↔ a = ⊥ ∨ a = succ ⊥ and related (#15567) We use these new results to golf down the ordinal API.

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