---
tag: 0A3HJX3KTF
kind: concept
name: Pseudometric space
msc: ["54E35"]
sources:
  - url: https://en.wikipedia.org/wiki/Pseudometric_space
    locator: lead section
same_as:
  wikidata: Q1397059
  wikipedia: Pseudometric space
---

## Summary

A pseudometric space is a set with a distance function that is almost a metric. The difference: two different points can have distance zero.