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0789dda | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | import Mathlib
namespace OAI
open scoped Pointwise symmDiff
namespace Ostmann
theorem main : ∀ A B : Set ℕ, A.Nontrivial → B.Nontrivial →
Set.Infinite ((A + B) ∆ {n : ℕ | Nat.Prime n}) := by
sorry
end Ostmann
end OAI
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