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Small proof change
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@ -152,7 +152,7 @@ Since we don't know how to show whether collatz terminates, we can't at this tim
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```lean
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theorem collatz_sound (n r : Nat) : (∃ t, collatz_fun n t = some r) → collatz n r := by
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intro (H: ∃ t, collatz_fun n t = some r)
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cases' H with t H
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obtain ⟨t, H⟩ := H
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revert H n r
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show ∀ (n r : Nat), collatz_fun n t = some r → collatz n r
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