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