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Small proof change

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Brandon Rozek 2024-04-16 22:02:34 -04:00
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content/blog/functions-inductive-propositions-lean4.md
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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
```lean ```lean
theorem collatz_sound (n r : Nat) : (∃ t, collatz_fun n t = some r) → collatz n r := by theorem collatz_sound (n r : Nat) : (∃ t, collatz_fun n t = some r) → collatz n r := by
intro (H: ∃ t, collatz_fun n t = some r) intro (H: ∃ t, collatz_fun n t = some r)
cases' H with t H obtain ⟨t, H⟩ := H
revert H n r revert H n r
show ∀ (n r : Nat), collatz_fun n t = some r → collatz n r show ∀ (n r : Nat), collatz_fun n t = some r → collatz n r