nLab metric topology

Contents

Context

Topology

topology (point-set topology, point-free topology)

see also differential topology, algebraic topology, functional analysis and topological homotopy theory

Introduction

Basic concepts

Universal constructions

Extra stuff, structure, properties

Examples

Basic statements

Theorems

Analysis Theorems

topological homotopy theory

Contents

Definition

Given a metric space (X,d)(X,d), the metric topology on XX is the structure of a topological space 𝒯\mathcal{T} on XX which is generated from the topological base of 𝒯\mathcal{T} given by the open balls

B(x,r)≔{y∈X|d(x,y)<r} B(x,r) \coloneqq \{y \in X \;|\; d(x,y) \lt r \}

for all x∈Xx \in X and r∈(0,∞)βŠ‚β„r \in (0,\infty) \subset \mathbb{R}.

A topological space whose topology is the metric topology for some metric space structure on its underlying set is called a metrizable topological space.

Last revised on April 9, 2020 at 01:46:50. See the history of this page for a list of all contributions to it.