4. Compactness
) is a compact space, that is, K is compact as a subset in (K,T K). The following three results, whose proofs are immediate from the definition, give methods of constructing compact sets. Proposition 4.1. A finite union of compact sets is compact. Proposition 4.2. Suppose (X,T ) is a topological space and K ⊂ X is a compact set.
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