54Axx Generalities
- 54A05 Topological spaces and generalizations (closure spaces, etc.)
- 54A10 Several topologies on one set (change of topology, comparison of topologies, lattices of topologies)
- 54A15 Syntopogeneous structures
- 54A20 Convergence in general topology (sequences, filters, limits, convergence spaces, etc.)
- 54A25 Cardinality properties (cardinal functions and inequalities, discrete subsets), See also {03Exx,
04A30}, {For ultrafilters, See 54D80}
- 54A35 Consistency and independence results, See also {03E35}
- 54A40 Fuzzy topology, See also {04A72}
- 54A99 None of the above but in this section
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