Filter.mem_vadd_filter

∀ {α : Type u_2} {β : Type u_3} [inst : VAdd α β] {f : Filter β} {s : Set β} {a : α},
  s ∈ a +ᵥ f ↔ (fun x => a +ᵥ x) ⁻¹' s ∈ f

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