
Our main result associates a family of congruences with each suitable system of nilpotent subgroups of a finite group. Using this result, we complete and correct the proof of a theorem of Hirsch concerning the class number of a finite group of odd order.
QA1-939, Sylow subgroups, Sylow properties, \(\pi\)-groups, \(\pi\)-structure, congruences, Nilpotent systems of subgroups, nilpotent systems of subgroups, Mathematics, Arithmetic and combinatorial problems involving abstract finite groups
QA1-939, Sylow subgroups, Sylow properties, \(\pi\)-groups, \(\pi\)-structure, congruences, Nilpotent systems of subgroups, nilpotent systems of subgroups, Mathematics, Arithmetic and combinatorial problems involving abstract finite groups
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