### 57-XX Manifolds and cell complexes,

{For complex manifolds, See 32C10}
- 57-00 General reference works (handbooks, dictionaries, bibliographies, etc.)
- 57-01 Instructional exposition (textbooks, tutorial papers, etc.)
- 57-02 Research exposition (monographs, survey articles)
- 57-03 Historical (must be assigned at least one classification number from 01-XX)
- 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
- 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}
- 57Sxx Topological transformation groups, see also {20F34, 22-XX, 54H15, 58D05}
- 57Txx Homology and homotopy of topological groups and related structures

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