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2. Prove that a finite union of compact sets is compact. Give an example of a countable union of compact sets which is not co
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., A are compact A, 42 Seti. cet. A = Ai Cal we a ant to show that is Compact Led. C be as spes cover Thes, c is an open coveAs each Thes, each Aj is compact, Aj has a finite scebcover of C.여 9 (; is finite (because each is firile and finile cenion of finile set is finit). and & Co is finile subcover of c for & A;nal - nal & tol Lel. A = [ ]. Then A = [t ] = (0, i Here. each A = (t D To compact but An= (0,] is not compache 21

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