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< 20Hxx | 20-XX | 20Kxx >
20-XX Group theory and generalizations
20Jxx Connections with homological algebra and category theory
20J05   Homological methods in group theory
20J06   Cohomology of groups
20J15   Category of groups
20J99   None of the above, but in this section
< 20Hxx | 20-XX | 20Kxx >
American Mathematical Society