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Normal subgroup
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== External links == * {{MathWorld|urlname=NormalSubgroup|title= normal subgroup}} * [https://encyclopediaofmath.org/wiki/Normal_subgroup Normal subgroup in Springer's Encyclopedia of Mathematics] * [http://www.math.uiuc.edu/~r-ash/Algebra/Chapter1.pdf Robert Ash: Group Fundamentals in ''Abstract Algebra. The Basic Graduate Year''] * [http://gowers.wordpress.com/2011/11/20/normal-subgroups-and-quotient-groups Timothy Gowers, Normal subgroups and quotient groups] * [http://math.ucr.edu/home/baez/normal.html John Baez, What's a Normal Subgroup?] [[Category:Subgroup properties]]
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