\int_{\mathbb R^D} \Delta S \cdot S \, dx
= -\int_{\mathbb R^D} \nabla S\cdot \nabla S\, dx
= \mean{(\nabla S)^2}
I want to write average symbol on $(\nabla S)^2$
but it is not workig.
How can I write?
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\int_{\mathbb R^D} \Delta S \cdot S \, dx
= -\int_{\mathbb R^D} \nabla S\cdot \nabla S\, dx
= \overline{(\nabla )^2 S}
or, as is suggested in comment
\documentclass{article}
\usepackage{amsmath,amssymb}
\begin{document}
\def\mean#1{\left< #1 \right>}
\[
\int_{\mathbb R^D} \Delta S \cdot S \, dx = -\int_{\mathbb R^D} \nabla S\cdot \nabla S\, dx = \mean{(\nabla S)^2}
\]
\end{document}
with the following result:
\def\mean#1{\left< #1 \right>}
?
Jun 12, 2013 at 19:22
\overline{..}
?\mean
,\def\mean{\overline}
should be a solution, but probably with an usage as in my answer.