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I am using \left< and \right> to indicate the average in an equation. Unfortunately it looks quite strange in the following example, as the automatic size estimation is different for both sides of the equation. Is there any way to fix this, so that it looks "correct"?

\documentclass{standalone}

\begin{document}

$\left< \Delta \eta \right>^2 \ll \left< \eta^2 \right>$

\end{document}

At the moment the output is as follows with clearly visible difference in size of the parentheses.

enter image description here

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2  
you can also use \langle and \rangle. –  percusse Oct 30 '12 at 14:43
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1 Answer 1

up vote 18 down vote accepted

Like this?

Code

\documentclass[border=2pt]{standalone}

\begin{document}

$\left< \Delta \eta\vphantom{^2} \right>^2 \ll \left< \eta^2 \right>$

\end{document}

Output

enter image description here

Or like that?

Code

\documentclass[border=2pt]{standalone}

\begin{document}

$\left< \Delta \eta \right>^2 \ll \left< \eta\smash{^2} \right>$

\end{document}

Output

enter image description here

Or with fixed-size delimeters

Code A

\documentclass[border=2pt]{standalone}

\begin{document}

$\bigl< \Delta \eta \bigr>^2 \ll \bigl< \eta^2 \bigr>$

\end{document}

Output A

enter image description here

Code B

\documentclass[border=2pt]{standalone}

\begin{document}

$\langle \Delta \eta \rangle^2 \ll \langle \eta^2 \rangle$

\end{document}

Output

enter image description here

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Wow, thank you for the instant answer and complete overview. –  Alexander Oct 30 '12 at 14:49
3  
I'd vote for the last method. –  egreg Oct 30 '12 at 21:08
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