So I have to find an infinite union of closed sets that isn't closed. I've thought of something that might work:(adsbygoogle = window.adsbygoogle || []).push({});

[itex]\bigcup[0,x][/itex] where [itex]0\leq x<1[/itex]. Then, [itex]\bigcup[0,x] = [0,1)[/itex], right?

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# Infinite union of closed sets that isn't closed?

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