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Abelian groups
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- 20K01 Finite abelian groups
- 20K10 Torsion groups, primary groups and generalized primary groups
- 20K15 Torsion-free groups, finite rank
- 20K20 Torsion-free groups, infinite rank
- 20K21 Mixed groups
- 20K25 Direct sums, direct products, etc.
- 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
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