no goals
R : Type u
inst✝¹ : Ring R
Γ₀ : Type v
inst✝ : LinearOrderedCommGroupWithZero Γ₀
_i : Valued R Γ₀
⊢ Filter.HasBasis (𝓝 0) (fun x => True) fun γ => {x | ↑v x < ↑γ}
simp [Filter.hasBasis_iff, is_topological_valuation]