I'm trying to type the conjugate of the fourier transform, so I want a bar over a hat. I only really know one way of doing this but these come out VERY scrambled:
$\overline{hat{f}}$ or $\bar{\hat{f}}$.
Help?
[Tex/LaTex] How to put a bar on top of a hat
stacking-symbols
Related Solutions
In this instance, I think \xrightarrow would suit you better. Here's an example using the former, and the traditional \overset from amsmath:
\documentclass{article}
\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\begin{document}
\[
\mathcal{X}\overset{k\rightarrow\infty}{\longrightarrow}\mathcal{Y} \qquad
\mathcal{X}\xrightarrow{k\rightarrow\infty}\mathcal{Y}
\]
\end{document}
\xrightarrow{<stuff>} is an extensible arrow, which conforms in length to the overset argument <stuff>.
You can use yhmath:
\documentclass{article}
\usepackage{yhmath}
\begin{document}
$\wideparen{\Delta k}+\wideparen{x+y+z}$
\end{document}
This changes the math extension symbol font, so you may not want to do it; in this case you can just import the needed math accent
\documentclass{article}
\DeclareSymbolFont{YHlargesymbols}{OMX}{yhex}{m}{n}
\DeclareMathAccent{\wideparen}{\mathord}{YHlargesymbols}{"F3}
\begin{document}
$\wideparen{\Delta k}+\wideparen{x+y+z}$
\end{document}
Best Answer
The
accentspackage was designed for exactly the problem of stacking accents:It redefines the way that accents are set up in regular LaTeX. This looks about right to me.
If you are using
unicode-math, the OpenType maths fonts should be able to stack their accents well by default:Well, it's not perfect…