∀ {B : Type u_1} {F : Type u_2} {Z : Type u_4} [inst : TopologicalSpace B] [inst_1 : TopologicalSpace F] {proj : Z → B}
  {s : Set B} (e : Pretrivialization F fun z => proj ↑z) [inst_2 : Nonempty (Z → F)] (x : B × F),
  e.domExtend.invFun x = ↑(e.invFun x)