A **subnormal series** of a group $G$ is a chain of subgroups,
\[ \langle e\rangle = H_0 \leq H_i \leq \cdots \leq H_{n} =G\]
where each $H_i$ is a normal subgroup of $H_{i+1}$.

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- Review status: reviewed
- Last edited by Kiran S. Kedlaya on 2019-04-20 16:16:24

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