∀ {𝕜 : Type u_1} {E : Type u_2} {F : Type u_3} [inst : Semiring 𝕜] [inst_1 : AddCommGroup E] [inst_2 : Module 𝕜 E]
  [inst_3 : TopologicalSpace E] [ContinuousAdd E] [ContinuousConstSMul 𝕜 E] [inst_6 : AddCommGroup F]
  [inst_7 : Module 𝕜 F] [inst_8 : TopologicalSpace F] [ContinuousAdd F] [ContinuousConstSMul 𝕜 F] {x : E} {s : Set E}
  {y : F} {t : Set F}, x ∈ closure s → ⇑(LinearMap.inr 𝕜 E F) '' tangentConeAt 𝕜 t y ⊆ tangentConeAt 𝕜 (s ×ˢ t) (x, y)