Set.image2_eq_iUnion

∀ {α : Type u_1} {β : Type u_2} {γ : Type u_3} (f : α → β → γ) (s : Set α) (t : Set β),
  Set.image2 f s t = ⋃ i ∈ s, ⋃ j ∈ t, {f i j}

The Set.image2 version of Set.image_eq_iUnion

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