### 55-XX Algebraic topology

- 55-00 General reference works (handbooks, dictionaries, bibliographies, etc.)
- 55-01 Instructional exposition (textbooks, tutorial papers, etc.)
- 55-02 Research exposition (monographs, survey articles)
- 55-03 Historical (must be assigned at least one classification number from 01-XX)
- 55-04 Explicit machine computation and programs (not the theory of computation or programming)
- 55-06 Proceedings, conferences, collections, etc.
- 55Mxx Classical topics, {For the topology of Euclidean spaces and manifolds, see {57Nxx} {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, {
57Rxx} {57R20, 57R22, 57R25}}
- 55Sxx Operations and obstructions
- 55Txx Spectral sequences, see also {18G40, 55R20}
- 55Uxx Applied homological algebra and category theory, see Also {
18Gxx}

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