∀ {H : Type u_5} [inst : TopologicalSpace H] (G : StructureGroupoid H) {M : Type u_6} [inst_1 : TopologicalSpace M]
  [inst_2 : ChartedSpace H M] [HasGroupoid M G] {e e' : OpenPartialHomeomorph M H},
  e ∈ atlas H M → e' ∈ atlas H M → e.symm.trans e' ∈ G