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Using the command \displaystyle \lim_{\Lambda \uparrow \mathbb{Z}^2} I can produce the limit that I desire. But I like to write the above limit as in the photo below. Could you help me? Thanked.

Ps. Correct me if I'm wrong about the Tags.

enter image description here

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2 Answers 2

up vote 6 down vote accepted

Use \DeclareMathOperator*:

\documentclass{article}
\usepackage{amsmath}
\DeclareMathOperator*{\limweak}{lim\,weak}

\begin{document}
\begin{equation}
  \limweak_{\Lambda \uparrow Z^2}
\end{equation}
\end{document}
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Try using \substack. (You will need to load the amsmath package):

$\substack{\mathrm{limweak}\\[0.1ex]\Lambda\uparrow Z}$

You can even define a command that takes as an argument the limit:

\newcommand{\limweak}[1]{\substack{\mathrm{limweak}\\[0.1ex]#1}}

P.S.: You can modify the height (0.1ex) to suit your needs.

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@ Count Zero. Thank's. –  Elias Feb 29 '12 at 17:26

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