case neg => exact exists_cindex_eq_order' hp h
f g : ℂ → ℂ
p : FormalMultilinearSeries ℂ ℂ ℂ
z z₀ c : ℂ
n : ℕ
U : Set ℂ
r : ℝ
hp : HasFPowerSeriesAt f p z₀
h : ¬p = 0
⊢ ∃ R > 0, ∀ r ∈ Set.Ioo 0 R, cindex z₀ r f = ↑(FormalMultilinearSeries.order p)
no goals