Mathematical Sciences Classification System
20Dxx - Abstract finite groups
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                            20D05Finite simple groups and their classification
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                            20D06Simple groups: alternating groups and groups of Lie type [See also 20Gxx]
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                            20D08Simple groups: sporadic groups
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                            20D10Solvable groups, theory of formations, Schunck classes, Fitting classes, $\pi$-length, ranks [See also 20F17]
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                            20D15Nilpotent groups, $p$-groups
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                            20D20Sylow subgroups, Sylow properties, $\pi$-groups, $\pi$-structure
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                            20D25Special subgroups (Frattini, Fitting, etc.)
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                            20D30Series and lattices of subgroups
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                            20D35Subnormal subgroups
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                            20D40Products of subgroups
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                            20D45Automorphisms
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                            20D60Arithmetic and combinatorial problems
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                            20D99None of the above, but in this section