Let be a group with normal series (, , ..., ). A normal factor of is a quotient group for some index . is a solvable group iff all normal factors are Abelian.
Normal Factor
See also
Abelian Group, Group, Normal Series, Normal Subgroup, Solvable GroupThis entry contributed by David Terr
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Terr, David. "Normal Factor." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/NormalFactor.html