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How can we align text in nested cases within all cases?

\documentclass[12pt,a4paper]{article} \usepackage[fleqn]{amsmath} \begin{document} \begin{align} \begin{cases} Equation 1 = 0 &\text{Align this 1} \\ \begin{cases} Equation 2 = 0, &\text{ Align this 2 } \\ Equation 3 = 0, &\text{ Align this 3 } \\ \end{cases}\\ Equation 4 = 0, &\text{ Align this 4} \end{cases} \end{align} \end{document}

This produces a "local" alignment within each case, but doesn't align through both cases, which I would like.

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  • Welcome to TeX.SE! Commented Sep 29, 2018 at 8:57

2 Answers 2

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Something like this?

enter image description here

\documentclass[12pt,a4paper]{article} \usepackage[fleqn]{amsmath} % for 'cases' environment \begin{document} \begin{equation} \begin{cases} Equation 1 = 0 & \text{Align this 1 } \\ \left\{ \begin{array}{@{} l @{}} Equation2 = 0 \\ Equation3 = 0 \end{array} \right. & \begin{array}{@{}l} \text{Align this 2 } \\ \text{Align this 3 } \end{array} \\ Equation 4 = 0, & \text{Align this 4 } \end{cases} \end{equation} \end{document}
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A slightly different alignment with empheq and blkarray:

\documentclass[12pt,a4paper]{article} \usepackage[fleqn]{empheq} \usepackage{blkarray} \begin{document} \begin{empheq}[left=\empheqlbrace]{equation} \raisebox{0pt}[\height][4ex]{ \begin{blockarray}{>{$}l<{$}l} Equation 1 = 0 & Align this 1 \\ \begin{block}{\{>{$}l<{$}l} Equation 2 = 0, & Align this 2 \\ Equation 3 = 0, & Align this 3 \\ \end{block} Equation 4 = 0, & Align this 4 \end{blockarray}} \end{empheq} \end{document}

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