20Exx Structure and classification of infinite or finite groups
- 20E05 Free nonabelian groups
- 20E06 Free products, free products with amalgamation, Higman-Neumann-Neumann extensions, and generalizations
- 20E07 Subgroup theorems
- 20E08 Groups acting on trees
- 20E10 Quasivarieties and varieties of groups
- 20E15 Chains and lattices of subgroups, subnormal subgroups, See also {20F22}
- 20E18 Limits, profinite groups
- 20E22 Extensions, wreath products, and other compositions, See also {20J05}
- 20E25 Local properties
- 20E26 Residual properties and generalizations
- 20E28 Maximal subgroups
- 20E32 Simple groups, See also {20D05}
- 20E34 General structure theorems
- 20E36 General theorems concerning automorphisms of groups
- 20E42 Groups with a $BN$-pair; buildings, See also {51E24}
- 20E99 None of the above but in this section
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