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  • ...up]] of <math>G</math>. Then, <math>H</math> is [[normal subgroup|normal]] in <math>G</math>. ...a characteristic subgroup, if for any [[automorphism]] <math>\sigma</math> of <math>G</math>, we have <math>\sigma(H) = H</math>.
    9 KB (1,259 words) - 22:29, 16 September 2011