I'm encountering subscripts of the form [itex]x_{\alpha_{i}}[/itex], where [itex]i\in \mathbb{N} [/itex], increasingly often in Real Analysis. Is the purpose of the double subscript to show that the index is countable? Another thing that seems to make sense is that the subscript of the index is to define an order on the index where [itex]\alpha_{1}=min({\alpha})[/itex]. Any thoughts? Thanks!(adsbygoogle = window.adsbygoogle || []).push({});

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