Source: wikibot/polynormal-subgroup
= Polynormal subgroup
{wiki=Polynormal_subgroup}
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.