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I want to have a substack under a "=" symbol. The obvious doesn't work. Has anybody tried that before?

    w =_{\substack{\epsilon \to 0}} 0

Thanks

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2 Answers 2

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Like this?

\documentclass{article}
\usepackage{amsmath}
\begin{document}
  \[
       w \underset{\epsilon \to 0}{=} 0
  \]
\end{document}

enter image description here

If you want it tight, use \mathclap from mathtools

\documentclass{article}
\usepackage{mathtools}
\begin{document}
  \[
       w \underset{\mathclap{\epsilon \to 0}}{=} 0
  \]
\end{document}

enter image description here

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An alternative solution would be to use the \limits command to make the subscript really go underneath the symbol (like the default behavior seen in \sum or \prod in \displaystyle); this requires the symbol to be a MathOperator though, so something like

$$w \mathop{=}\limits_{\mathclap{\substack{\epsilon \to 0}}} 0$$

or even without \substack (\substack necessary if you have multiple lines you want underneath) would work.

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