Maß und Kategorie von Summenmengen.
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Dietmar Kahnert (1973)
Mathematische Zeitschrift
R. Baekeland, Robert Lowen (1995)
Commentationes Mathematicae Universitatis Carolinae
We investigate whether in the setting of approach spaces there exist measures of relative compactness, (relative) sequential compactness and (relative) countable compactness in the same vein as Kuratowski's measure of compactness. The answer is yes. Not only can we prove that such measures exist, but we can give usable formulas for them and we can prove that they behave nicely with respect to each other in the same way as the classical notions.
Jun-iti Nagata (1988)
Commentationes Mathematicae Universitatis Carolinae
Schwartz, Richard Evan (2004)
Geometry & Topology
Dontchev, Julian, Ganster, Maximilian (2002)
Bulletin of the Malaysian Mathematical Sciences Society. Second Series
Guran, Liliana (2009)
Surveys in Mathematics and its Applications
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