Compactness
From Maths
Revision as of 14:23, 13 February 2015 by Alec (Talk | contribs) (Created page with " ==Definition== A topological space is compact if every open cover (often denoted <math>\mathcal{A}</math>) of <math>X</math> contains...")
Definition
A topological space is compact if every open cover (often denoted A) of X contains a finite sub-collection that also covers X
Lemma for a set being compact
TODO: Note: details on Munkres p164
