20Kxx Abelian groups

• 20K01 Finite abelian groups
• 20K05 Finitely generated groups
• 20K10 Torsion groups, primary groups and generalized primary groups
• 20K12 Ulm sequences
• 20K15 Torsion free groups, finite rank
• 20K20 Torsion free groups, infinite rank
• 20K21 Mixed groups
• 20K25 Direct sums, direct products, etc.
• 20K26 Indecomposable groups
• 20K27 Subgroups
• 20K30 Automorphisms, homomorphisms, endomorphisms, etc.
• 20K35 Extensions
• 20K40 Homological and categorical methods
• 20K45 Topological methods, See also {22A05, 22B05}
• 20K99 None of the above but in this section