refine (mapsTo_rectangleBorder_right_re z w).mono_right (Set.subset_diff.mpr ?_)
z✝ w✝ : ℂ
c : ℝ
z w p : ℂ
pNotOnBorder : p ∉ RectangleBorder z w
⊢ MapsTo (fun y => ↑w.re + ↑y * I) [[z.im, w.im]] (Rectangle z w \ {p})
z✝ w✝ : ℂ
c : ℝ
z w p : ℂ
pNotOnBorder : p ∉ RectangleBorder z w
⊢ RectangleBorder z w ⊆ Rectangle z w ∧ Disjoint (RectangleBorder z w) {p}