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On the normal p-structure of a finite group and related topics. I. (English) Zbl 0405.20015

##### MSC:
 20D05 Finite simple groups and their classification 20D10 Finite solvable groups, theory of formations, Schunck classes, Fitting classes, $$\pi$$-length, ranks 20D20 Sylow subgroups, Sylow properties, $$\pi$$-groups, $$\pi$$-structure
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