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Sep 13, 2018 at 16:12 comment added Sven Wirsing Taft has enhanced this theorem within his article Earl J. Taft, Orthogonai Conjugacies in Finite Groups, Math. Annalen 170, 37-40, 1967.
Sep 7, 2018 at 23:26 comment added Richard Lyons Yes, fair enough.
Sep 6, 2018 at 15:42 comment added Frieder Ladisch Yes, indeed. But in the particular situation of the question, we know that $N$ is nilpotent (in fact a $p$-group).
Sep 5, 2018 at 20:56 comment added Richard Lyons Interestingly, the proof in these sources depends on knowing that at least one of $G$ and $N$ is solvable. This in turn is justified by quoting the Odd Order Theorem of Feit and Thompson.
Sep 3, 2018 at 23:40 vote accept Sven Wirsing
Sep 3, 2018 at 17:33 history answered Frieder Ladisch CC BY-SA 4.0