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Observe the following Lean code: example : (∃ x : A, PP x) → (∀ y : A, PP...
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Observe the following Lean code:
example : (∃ x : A, PP x) → (∀ y : A, PP y → QQ y) → ∃ z : A , QQ z :=
begin
assume p pq,
cases p with a pa,
sorry,
apply pq,
exact pa,
end
Replace sorry with the correct Lean code.❌
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