Mathematical Sciences Classification System
20Kxx - Abelian groups
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20K01
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20K10Torsion groups, primary groups and generalized primary groups
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20K15Torsion-free groups, finite rank
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20K20Torsion-free groups, infinite rank
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20K21Mixed groups
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20K25Direct sums, direct products, etc.
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20K27Subgroups
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20K30Automorphisms, homomorphisms, endomorphisms, etc.
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20K35Extensions
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20K40Homological and categorical methods
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20K45
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20K99None of the above, but in this section