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55Nxx - Homology and cohomology theories

55N05 - Cech types
55N07 - Steenrod-Sitnikov homologies
55N10 - Singular theory
55N15 - $K$-theory
55N20 - Generalized (extraordinary) homology and cohomology theories
55N22 - Bordism and cobordism theories, formal group laws
55N25 - Homology with local coefficients, equivariant cohomology
55N30 - Sheaf cohomology
55N33 - Intersection homology and cohomology
55N34 - Elliptic cohomology
55N35 - Other homology theories
55N40 - Axioms for homology theory and uniqueness theorems
55N45 - Products and intersections
55N91 - Equivariant homology and cohomology
55N99 - Miscellaneous
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