55Uxx Applied homological algebra and category theory [See also 18Gxx]
- 55U05 Abstract complexes (2)
- 55U10 Simplicial sets and complexes
- 55U15 Chain complexes
- 55U20 Universal coefficient theorems, Bockstein operator
- 55U25 Homology of a product, Künneth formula
- 55U30 Duality
- 55U35 Abstract and axiomatic homotopy theory
- 55U40 Topological categories, foundations of homotopy theory
- 55U99 None of the above, but in this section