theorem_proving_in_lean4
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Typo in Chapter 8: ∀ y, r y x → Acc r y should be ∀ y, r y x → Acc r x
https://github.com/leanprover/theorem_proving_in_lean4/blob/ce23823e0e33bd153095dc307eae0341da2d9915/induction_and_recursion.md?plain=1#L684