# How to align subequations within table

I would like to reproduce the structure, alignment, and numbering, of the equations in this table:

I have tried many combinations of the environments equation, subequation, align, table / tabular, tried Mathpix snip, and referenced related question Nesting subequations within align, but have not been able to find a solution, mainly due to my inexperience with LaTeX.

This can be done with subequations and two minipages, each with its own align environment. Note that to keep the vertical spacing equal in the two minipages I added a \vphantom fraction to each of the left equations so they had the same height as the right equations.

\documentclass{article}

\usepackage{amsmath,lipsum}

\begin{document}
\lipsum[1]

\begin{subequations}
\noindent\begin{minipage}{.4\textwidth}
\begin{align}
\nabla\cdot\vec E\vphantom{\frac{\partial \vec B}{\partial t}} &= \frac{\rho}{\epsilon_0}, \\
\nabla\cdot\vec B\vphantom{\frac{\partial \vec B}{\partial t}} &= 0,
\end{align}
\end{minipage}% <-- % symbol necessary
\begin{minipage}{.6\textwidth}
\begin{align}
\nabla\times\vec E &= -\frac{\partial \vec B}{\partial t}, \\
\nabla\times\vec B &= \mu_0\epsilon_0\frac{\partial \vec E}{\partial t}+\mu_0\vec j,
\end{align}
\end{minipage}
\end{subequations}
\vspace{\baselineskip}

\lipsum[2]

\end{document}


I set the left minipage at 40% of \textwidth, and the right at 60%, but you can adjust to your liking.