∀ {X : Type u_1} [inst : TopologicalSpace X] [R1Space X] [LocallyCompactSpace X] {K V : Set X},
  IsCompact K →
    IsOpen V → K ⊆ V → ∃ f, Set.EqOn (⇑f) 1 K ∧ IsCompact (tsupport ⇑f) ∧ tsupport ⇑f ⊆ V ∧ ∀ (x : X), f x ∈ Set.Icc 0 1