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I need to write a formula with a \widecheck over two \hat. The equation is the following:

\documentclass[a4paper,11pt]{article}
\usepackage{amsmath} 
\usepackage{amsfonts,amssymb,mathabx}

\begin{document}
\begin{equation}
\tilde{A}^\mu_\Lambda = \widehat{\widehat{G}\cdot\widehat{j^\mu_\Lambda}}.
\end{equation}
\end{document}

If I write this code I obtain a lot of errors (undefined control sequence, missing number treated as zero, illegal unit of measure (pt inserted), etc...).

If I use \widehat instead of \widecheck, the result is the same. I have problems also writing

\widecheck{\hat{G} \cdot j}

because the result is not correct (G is translated to the right and overwrites j).

How can I write the \widecheck?

marked as duplicate by egreg, Guido, Werner, Benedikt Bauer, Martin Schröder May 16 '14 at 21:21

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  • Welcome to TeX.SX! This is another example of the bug described in Why do arguments to nested tilde or breve commands reappear when amsmath is used?; the solutions shown there seem to apply to your case as well. – egreg May 16 '14 at 19:32
  • Finally I solved following egreg's suggestion. Thank you, egreg – user51852 May 16 '14 at 19:59
  • I voted for closing as duplicate. Don't worry about this: it's not a judgment on your question, but our way to keep the information as tight as possible. Welcome again! – egreg May 16 '14 at 20:04
  • Ok, there's no problem. I've written an answer with the code I used, but I can't post it until 3a.m.! – user51852 May 16 '14 at 20:21

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