Let H be a subgroup of G and let g be an element of G.
Chapter 4, Problem 27SE(choose chapter or problem)
Let H be a subgroup of G and let g be an element of G. Prove that \(\mathrm {N(gHg}^{-1}) = \mathrm {gN(H)g}^-1\). See Exercise 2 for the notation.
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