5500  General reference works (handbooks, dictionaries, bibliographies, etc.)


5501  Instructional exposition (textbooks, tutorial papers, etc.)


5502  Research exposition (monographs, survey articles)


5503  Historical (must also be assigned at least one classification number from Section 01)


5504  Explicit machine computation and programs (not the theory of computation or programming)


5506  Proceedings, conferences, collections, etc.



55Mxx  Classical topics {For the topology of Euclidean spaces and manifolds, see 57Nxx}

55Nxx  Homology and cohomology theories [See also 57Txx]

55Pxx  Homotopy theory {For simple homotopy type, see 57Q10}

55Qxx  Homotopy groups

55Rxx  Fiber spaces and bundles [See also 18F15, 32Lxx, 46M20, 57R20, 57R22, 57R25]

55Sxx  Operations and obstructions

55Txx  Spectral sequences [See also 18G40, 55R20]

55Uxx  Applied homological algebra and category theory [See also 18Gxx]
