exact not_mem_erase (⟨0, pb.dim_pos⟩ : Fin pb.dim) univ
K : Type u_1
inst✝ : Field K
pb : PowerBasis ℤ (𝓞 K)
x : 𝓞 K
H : ∑ i ∈ insert ⟨0, ⋯⟩ (univ.erase ⟨0, ⋯⟩), (pb.basis.repr x) i • (fun i => pb.gen ^ ↑i) i = x
⊢ ⟨0, ⋯⟩ ∉ univ.erase ⟨0, ⋯⟩
no goals