Definition
- For any free ultrafilter? D on N, a topological space X is called D-feebly compact if for every sequence of nonempty open subsets of X there is a point p in X such that for every neighbourhood V of p,
Reference
- Encyclopedia of general topology, Edited by Klaas Pieter Hart, Jun-iti Nagata and Jerry E. Vaughan. Elsevier Science Publishers, B.V., Amsterdam, 2004.