Simple group
Group without normal subgroups other than the trivial group and itself / From Wikipedia, the free encyclopedia
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In mathematics, a simple group is a nontrivial group whose only normal subgroups are the trivial group and the group itself. A group that is not simple can be broken into two smaller groups, namely a nontrivial normal subgroup and the corresponding quotient group. This process can be repeated, and for finite groups one eventually arrives at uniquely determined simple groups, by the Jordan–Hölder theorem.
The complete classification of finite simple groups, completed in 2004, is a major milestone in the history of mathematics.