nhdsWithin

{X : Type u_1} → [TopologicalSpace X] → X → Set X → Filter X

The "neighborhood within" filter. Elements of 𝓝[s] x are sets containing the intersection of s and a neighborhood of x.

Defined in: Mathlib.Topology.Defs.Filter
Cited by: 1,912 results in Mathlib
Foundations: Depth 48 from the axioms, rests on 538 definitions · uses propext, Quot.sound
Assumes: TopologicalSpace

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