---
tag: 00CR00C9DN
kind: concept
name: Countably infinite set
aliases: [denumerable, enumerable]
msc: ["03E10"]
specializes: [01TQB88H4C, 0PWE3BCHVJ]
sources:
  - url: https://en.wikipedia.org/wiki/Countable_set
    locator: Definition
inventory: [JFB4D3GAYD]
---

## Summary

A countably infinite set is a set that is equinumerous with the set of natural numbers.