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Types of ultrafilters on countable sets. (English) Zbl 0206.52004

General Topology and its Relations to modern Analysis and Algebra 2, Proc. 2nd Prague topol Sympos. 1966, 142-143 (1967).

MSC:

54H25 Fixed-point and coincidence theorems (topological aspects)
54D35 Extensions of spaces (compactifications, supercompactifications, completions, etc.)
Full Text: EuDML