---
tag: Q63R275HMY
kind: concept
name: Regular
sources:
  - wikipedia: en:43580500@r1360947732
    locator: Glossary of set theory, section R
    note: adopted
    mention: wikipedia://en/43580500#0RHT
    sections: [Summary]
inventory: [MRADHVQZM9]
---

## Summary

A regular cardinal is one equal to its own cofinality; a regular ordinal is a limit ordinal that is equal to its own cofinality.