Long description: subscript
Alt text: The image illustrates the notation \(u_j^n\), with labels describing the roles of the superscript and the subscript.
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- The mathematical term displayed is \(u_j^n\).
- An arrow points to the superscript '\(n\)' and is labeled "the superscript counts up the \(t\) values".
- An arrow points to the subscript '\(j\)' and is labeled "the subscript counts across the \(x\) values".