---
tag: 0ZZR8D7Y1Z
kind: concept
name: Subnormal series
msc: ["20E15"]
sources:
  - url: https://en.wikipedia.org/wiki/Subgroup_series
    locator: Normal series, subnormal series
---

## Summary

A subnormal series of a group is a finite chain of subgroups from the trivial subgroup to the whole group.
Each subgroup in the chain is normal in the next one.
Its factor groups are the quotients of consecutive terms.