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6. Let X be an infinite set and let U = {0}U{A CX :X \ A is finite}. (a) Prove that U is a topology on X. (b) Let B be an inf
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6. ala § 9 ?ь Хя сх: Хя с is finire? a. 1. феи. xcx 2 X-X:Ф (кімге r x El.요 Ler { vazd be an be an arbita arbitasy collection of open ssen ser in u. ri X VA is finire for all a. Jim -> a CX-Va) initeܢܶܪ Ler, I valcon be a finite Collection of open ser in u. x-v is finive for h=1,2,...m. as X- ^ VA ů (x-4) ?) mal finite 2 n

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