I am new to LyX, and I can't figure out how to display multiple
equations on the same line. For example, if I want x = y and a = b
on the same line with a reasonable amount of space between them, I
don't see how to use the LaTeX \qquad command in the middle of a
Display Formula environment. I also have a problem with displaying
multiple equations one equation above another if they contain
fractions -- the fraction is too small. The easiest way to see this
is to typeset the following LaTeX code and try to duplicate it using
the Math Panel in LyX. Here is the code I was using (as part of a
larger document):
\documentclass{article}
\usepackage{amsmath, amssymb}
\begin{document}
The vacuum Maxwell equations are
\begin{subequations} \label{maxwell}
\begin{align}
\nabla \cdot \vec{B} &= 0 & \nabla \times \vec{E} + \frac{\partial
\vec{B}}{\partial t} &= 0 \label{first} \\
\nabla \cdot \vec{E} &= 0 & \nabla \times \vec{B} - \frac{\partial
\vec{E}}{\partial t} &= 0\label{second}
\end{align}
\end{subequations}
If we let $\vec{B} \mapsto \vec{E}$ and $\vec{E} \mapsto -\vec{B}$,
then this \textbf{duality} transformation takes \eqref{first} into
\eqref{second} and \emph{vice versa}. If we define the complex vector
field
\begin{equation} \label{field}
\vec{\mathcal{E}} = \vec{E} + i\vec{B}
\end{equation}
then duality amounts to the transformation $\vec{\mathcal{E}} \mapsto
i\vec{\mathcal{E}}$, and the Maxwell equations \eqref{maxwell} become
simply two equations for $\vec{\mathcal{E}}$:
\begin{equation} \label{dualmax}
\nabla \cdot \vec{\mathcal{E}} = 0 \qquad \nabla \times \vec{\mathcal
{E}} = i \frac{\partial \vec{\mathcal{E}}}{\partial t}
\end{equation}
\end{document}
The User Guide doesn't seem to address any of this. Any advice would
be appreciated.
