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A **polynormal subgroup** is a concept from group theory, particularly in the study of group extensions and solvable groups. A subgroup \( N \) of a group \( G \) is called **polynormal** if for every finite sequence of subgroups \( H_1, H_2, \ldots, H_n \) of \( G \) such that: 1. \( H_1 \) is a subgroup of \( N \), 2.

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  1. Subgroup properties
  2. Group theory
  3. Fields of abstract algebra
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