The set [itex]\{1,2,3,4,5\ldots\}[/itex]...is it closed as a subset of [itex]\mathbb{R}[/itex]? I'm thinking "yes," but I'm unsure of myself for some reason. (And yes, this is just the set of positive integers.(adsbygoogle = window.adsbygoogle || []).push({});

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# Is this a closed set?

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