obtain ⟨ε, hε0, hε⟩ := ((Complex.nhds_hasBasis_square p).1 _).mp pInRectInterior
z✝ w✝ : ℂ
c : ℝ
z w p : ℂ
pInRectInterior : Rectangle z w ∈ 𝓝 p
⊢ ∀ᶠ (c : ℝ) in 𝓝[>] 0, Square p c ⊆ Rectangle z w
case intro.intro
z✝ w✝ : ℂ
c : ℝ
z w p : ℂ
pInRectInterior : Rectangle z w ∈ 𝓝 p
ε : ℝ
hε0 : 0 < ε
hε : Square p ε ⊆ Rectangle z w
⊢ ∀ᶠ (c : ℝ) in 𝓝[>] 0, Square p c ⊆ Rectangle z w