simpa using differentiableOn_inv.mono fun s hs ↦ hs.2
x σ σ' σ'' T : ℝ
α : Type u_1
β : Type u_2
inst✝³ : LinearOrder β
inst✝² : NoMaxOrder β
inst✝¹ : TopologicalSpace β
inst✝ : ClosedIciTopology β
y : β
l : Filter α
xpos : 0 < x
c : ℝ
bddAbove : BddAbove ((Norm.norm ∘ fun s => ↑x ^ s / (s * (s + 1)) - 1 / s) '' (Square 0 c \ {0}))
cpos : 0 < c
right✝ : c < 1 / 2
RectSub : Square 0 c \ {0} ⊆ {0, -1}ᶜ
fHolo : HolomorphicOn (f x) (Square 0 c \ {0})
⊢ DifferentiableOn ℂ (fun y => (fun s => 1 / s) y) (Square 0 c \ {0})
no goals