---
tag: VSBQ20KQPM
kind: concept
name: Additively
sources:
  - wikipedia: en:43580500@r1360947732
    locator: Glossary of set theory, section A
    note: adopted
    mention: wikipedia://en/43580500#ANNU
    sections: [Summary]
inventory: [Q70TP5173F]
---

## Summary

An ordinal is called additively indecomposable if it is not the sum of a finite number of smaller ordinals. These are the same as gamma numbers or powers of *ω*.