1. Suppose open sets [tex]V_{\alpha}[/tex] where [tex] V_{\alpha} \subset Y \: \forall \alpha [/tex], is it true that the union of all the [tex]V_{\alpha}[/tex] will belong in Y? (i.e. [tex]\bigcup_{\alpha} V_{\alpha} \subset Y[/tex])(adsbygoogle = window.adsbygoogle || []).push({});

Thanks!

M

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# Union of sets | quick question

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