---
tag: 01TQB88H4C
kind: concept
name: Countable set
aliases: [at-most-countable, denumerable-or-finite]
msc: ["03E10"]
sources:
  - url: https://en.wikipedia.org/wiki/Countable_set
    locator: lead section
same_as:
  wikidata: Q66707394
  wikipedia: Countable set
---

## Summary

A countable set is a set whose elements can be listed in a finite or infinite sequence.
It is finite or equinumerous with the natural numbers.