∀ {X : Type u_1} {Y : Type u_3} {Z : Type u_5} [inst : TopologicalSpace X] [inst_1 : TopologicalSpace Y]
  [inst_2 : TopologicalSpace Z] (e : OpenPartialHomeomorph X Y) (e' : OpenPartialHomeomorph Y Z),
  ↑e'.symm '' (e.trans e').target = e'.source ∩ e.target