∀ {𝕜 : Type u_1} {E : Type u_2} [inst : Field 𝕜] [inst_1 : LinearOrder 𝕜] [IsStrictOrderedRing 𝕜]
  [inst_3 : TopologicalSpace E] [inst_4 : AddCommMonoid E] [inst_5 : Module 𝕜 E] {s : Set E},
  IsClosed s → StrictConvex 𝕜 s → ThreeAPFree (frontier s)