Coarse topologies in nonstandard extensions via separative ultrafilters. (English) Zbl 0496.54040
MSC:
54J05 | Nonstandard topology |
03H99 | Nonstandard models |
54D15 | Higher separation axioms (completely regular, normal, perfectly or collectionwise normal, etc.) |
54D35 | Extensions of spaces (compactifications, supercompactifications, completions, etc.) |
54A25 | Cardinality properties (cardinal functions and inequalities, discrete subsets) |