## 57-XX MANIFOLDS AND CELL COMPLEXES (For complex manifolds, see 32Qxx)

- 57-00 General reference works (handbooks, dictionaries, bibliographies, etc.)
- 57-01 Instructional exposition (textbooks, tutorial papers, etc.) (1)
- 57-02 Research exposition (monographs, survey articles)
- 57-03 Historical (must also be assigned at least one classification number from Section 01)
- 57-04 Explicit machine computation and programs (not the theory of computation or programming)
- 57-06 Proceedings, conferences, collections, etc.
- 57Mxx Low-dimensional topology
- 57Nxx Topological manifolds (1)
- 57Pxx Generalized manifolds [See also 18F15]
- 57Qxx PL-topology
- 57Rxx Differential topology (For foundational questions of differentiable manifolds, see 58Axx; for infinite-dimensional manifolds, see 58Bxx) (1)
- 57Sxx Topological transformation groups [See also 20F34, 22-XX, 37-XX, 54H15, 58D05] (1)
- 57Txx Homology and homotopy of topological groups and related structures