Set.mem_vadd

∀ {α : Type u_2} {β : Type u_3} [inst : VAdd α β] {s : Set α} {t : Set β} {b : β},
  b ∈ s +ᵥ t ↔ ∃ x ∈ s, ∃ y ∈ t, x +ᵥ y = b

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