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The problem is the odd placement of g in the second line in the align environment. Strangely, the \dot{}-character is only misplaced if it is followed by another character. I need the mathabx package for some symbols and would therefore prefer an alternative to this question. Without mathabx everything works as expected. 

\documentclass[10pt,a4paper]{article} \usepackage[ngerman]{babel} \usepackage{mathtools} \usepackage{mathabx} \begin{document} \begin{align*} \widetilde{g\dot{g}}\\ \widetilde{\dot{g}g} \end{align*} \end{document}
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The problem is the same as exposed in Why do arguments to nested \tilde or \breve commands reappear when amsmath is used? Here it appears in a less spectacular way, the effect of mathabx is just to produce it also with widetilde. The solution is always the same:

\documentclass[10pt,a4paper]{article} \usepackage[ngerman]{babel} \usepackage{mathtools} \usepackage{mathabx} \newsavebox{\accentbox} \newcommand{\compositeaccents}[2]{% \sbox\accentbox{$#2$}#1{\usebox\accentbox}} \begin{document} \begin{align*} \compositeaccents{\widetilde}{g\dot{g}}\\ \compositeaccents{\widetilde}{\dot{g}g} \end{align*} \end{document}

Of course, you can use whatever name you want instead of \compositeaccents.

enter image description here

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  • Thank you! Especially your answer in the linked question above is very instructive. Commented Jan 13, 2014 at 21:06
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One fix is to put the expression in a box first (incorporating it into a redefined \widetilde):

\documentclass[10pt,a4paper]{article} \usepackage[ngerman]{babel} \usepackage{mathtools} \usepackage{mathabx} \newsavebox\tempbox \let\svwidetilde\widetilde \renewcommand\widetilde[1]{\sbox\tempbox{$#1$}\svwidetilde{\usebox{\tempbox}}} \begin{document} \begin{align*} \widetilde{g\dot{g}}\\ \widetilde{\dot{g}g} \end{align*} \end{document}

enter image description here

Alternately, one can, as a workaround, use scalerel package to stretch the tilde, and stackengine package to set it atop the expression.

\documentclass[10pt,a4paper]{article} \usepackage[ngerman]{babel} \usepackage{mathtools} \usepackage{mathabx} \usepackage{stackengine} \stackMath \usepackage{scalerel} \begin{document} \begin{align*} \widetilde{g\dot{g}}\\ \stackon[0pt]{\dot{g}g}{\hstretch{1.4}{\sim}}\\ %\widetilde{\dot{g}g} \end{align*} \end{document}

enter image description here

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