Let [itex]\mathcal{S} = \{S_{i}:i \in \mathbb{R} \} [/itex] where [itex]S_{i}[/itex] is a set. Then [itex]\mathcal{S}[/itex] is a set? Or, can this notation make sense in some way?(adsbygoogle = window.adsbygoogle || []).push({});

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# The class indexed by real numbers is a set?

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