Hi all While LaTeX-fill-environment works well in align, it breaks to «many lines» in aligned environments, as the following example show \documentclass[10pt,reqno]{amsart} \usepackage{amsmath,amssymb,amsthm} \begin{document} before filling \begin{align} \label{eq:test:1} & - \left(1- \mu_p^{\prime}\right) \left( 1 + \frac{\left\vert \nabla\phi \right\vert^{2}}{\left[ \left( \partial_t\phi \right)^{2} - \left\vert \nabla\phi \right\vert^{2}\right]} \right) \left[ \left(\varkappa + D_t\Omega\right)\partial_t\Phi +\delta^{ab}D_b\Omega \partial_a\Phi\right ] \end{align}
After filling \begin{align} \label{eq:test:1} & - \left(1- \mu_p^{\prime}\right) \left( 1 + \frac{\left\vert \nabla\phi \right\vert^{2}}{\left[ \left( \partial_t\phi \right)^{2} - \left\vert \nabla\phi \right\vert^{2}\right]} \right) \left[ \left(\varkappa + D_t\Omega\right)\partial_t\Phi +\delta^{ab}D_b\Omega \partial_a\Phi\right ] \end{align} However Before filling \begin{equation} \label{eq:test:1} \begin{aligned} & - \left(1- \mu_p^{\prime}\right) \left( 1 + \frac{\left\vert \nabla\phi \right\vert^{2}}{\left[ \left( \partial_t\phi \right)^{2} - \left\vert \nabla\phi \right\vert^{2}\right]} \right) \left[ \left(\varkappa + D_t\Omega\right)\partial_t\Phi +\delta^{ab}D_b\Omega \partial_a\Phi\right ] \end{aligned} \end{equation} after filling \begin{equation} \label{eq:test:1} \begin{aligned} & - \left(1- \mu_p^{\prime}\right) \left( 1 + \frac{\left\vert \nabla\phi \right\vert^{2}}{\left[ \left( \partial_t\phi \right)^{2} - \left\vert \nabla\phi \right\vert^{2}\right]} \right) \left[ \left(\varkappa + D_t\Omega\right)\partial_t\Phi +\delta^{ab}D_b\Omega \partial_a\Phi\right ] \end{aligned} \end{equation} \end{document} A simple solution would be that the user could say add a % at the end of line to indicate do not fill/break, the other solution would to understand why aligned is treated differently to aligned. Thanks and regards Uwe Brauer -- Warning: Content may be disturbing to some audiences I strongly condemn Putin's war of aggression against the Ukraine. I support to deliver weapons to Ukraine's military. I support the ban of Russia from SWIFT. I support the EU membership of the Ukraine. https://addons.thunderbird.net/en-US/thunderbird/addon/gmail-conversation-view/
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