
It is shown that in certain classes of finite groups, inner automorphisms are characterized by an extension property and also by a dual lifting property. This is a consequence of the fact that for any finite group G G and any prime p p , there is a p p -group P P and a semidirect product H = G P H = GP such that P P is characteristic in H H and every automorphism of H H induces an inner automorphism on H / P H/P .
Automorphisms of infinite groups, nilpotent \(\pi \) -groups, extendibility property, Sylow subgroups, Sylow properties, \(\pi\)-groups, \(\pi\)-structure, solvable \(\pi \) -groups, inner automorphisms, special p-subgroup, Automorphisms of abstract finite groups
Automorphisms of infinite groups, nilpotent \(\pi \) -groups, extendibility property, Sylow subgroups, Sylow properties, \(\pi\)-groups, \(\pi\)-structure, solvable \(\pi \) -groups, inner automorphisms, special p-subgroup, Automorphisms of abstract finite groups
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