## DormanResearch : SomethingOverSymbolReferers: LatexHints :: (Remote :: Orphans :: Tree ) |
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Do

\mathop{\longrightarrow}\limits^{\mathcal{L}}

This produces a \mathop with the horizontal spacing appropriate to a one of those (\sum for example). An arrow is normally treated as a math relation so this should be wrapped in \mathrel{}. Thatis essentially the latex definition of \stackrel and the plain tex definition of \buildrel as in \buildrel {\cal L}\over\longrightarrow. Or

\stackrel{\mathcal{L}}{\longrightarrow}

Much better for math relations.I have found that \stackrel may not use the same font on top and bottom, but this works:

\mathop{\sum_{j=1}^n}_{j\neq i}

to layer the condition $j\ne i$ under the sum over $j$.Also see \underbrace{a+b}_{\mbox{text below}}

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