20XX 


Group theory and generalizations 

20Dxx 

Abstract finite groups 


20D05 
Finite simple groups and their classification 


20D06 
Simple groups: alternating groups and groups of Lie type [See also 20Gxx] 


20D08 
Simple groups: sporadic groups 


20D10 
Solvable groups, theory of formations, Schunck classes, Fitting classes, $\pi$length, ranks [See also 20F17] 


20D15 
Nilpotent groups, $p$groups 


20D20 
Sylow subgroups, Sylow properties, $\pi$groups, $\pi$structure 


20D25 
Special subgroups (Frattini, Fitting, etc.) 


20D30 
Series and lattices of subgroups 


20D35 
Subnormal subgroups 


20D40 
Products of subgroups 


20D45 
Automorphisms 


20D60 
Arithmetic and combinatorial problems 


20D99 
None of the above, but in this section 