3

I use ${\dot \hat E}$ to put a hat and dot on top of an E simultaneously. However, an error occurs.

  • Welcome to TeX.SE! – SAM Jul 2 '16 at 4:12
  • $\dot{\hat{E}}$ should help ... – Zarko Jul 2 '16 at 4:16
10

First, be sure to load the amsmath package, as it provides for better positioning of stacked math accents. Second, write

$\dot{\hat{E}}$ 

A full MWE (minimum working example):

enter image description here

\documentclass{article}
\usepackage{amsmath}
\begin{document}
$\dot{\hat{E}}$ 
\end{document}

Just for comparison, here's the output of \dot{\hat{E}} if the amsmath package is not loaded:

enter image description here

  • 1
    This shows why it's preferable to always teach the “braced syntax" – egreg Jul 2 '16 at 10:58
  • Question of taste for you @Mico: if dot denotes time derivative and hat denotes preferred reference frame, would it make more sense to \hat{\dot\omega} or \dot{\hat\omega}? – Steven B. Segletes Jul 17 '18 at 17:38
  • Perhaps \frac{d\hat\omega_k}{dt} makes the moist sense. – Steven B. Segletes Jul 17 '18 at 17:46
  • 1
    @StevenB.Segletes - Thanks for these comments. I will readily concede that your understanding of what the dot and hat accents may mean is probably (almost surely, actually! -- I'm an economist; dot-accents tend to be used but rarely in mathematical economics and econometrics) a lot better than mine. I especially like the suggestion of not using both accents in combination and to "differential fraction" notation instead. Readers will quite likely agree. – Mico Jul 17 '18 at 18:02

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