#enumeratealignamsmathmath-modevertical alignment
If I type
\begin{enumerate}
\item
\begin{align*}
eqn 1
eqn 2
\end{align*}
\end{enumerate}
the label will appear on the first lines and the equations will appear on subsequent lines. How do I make it so that the equations begin on the same line as the enumerate label? Obviosly, I could manually adjust the location using \vspace and \rule, but is there a better way?
Regarding your caption problem. I don't get any error. I would suspect that your caption.sty is too old.
I have caption.sty 2010/01/09 v3.1m Customizing captions (AR)
I had been using Philippe Goutet's solution posted here, but have fairly recently found a simpler solution of using the aligned environment with the optional [t] alignment:
\item $\begin{aligned}[t]
x^2 + y^2 &= x^2 + (iy)^2 \\
&= (x + iy) (x - iy)
\end{aligned}$
which yields:
showframe package was used to show the page margins.\documentclass{article}
\usepackage{showframe}
\usepackage{amsmath}
\begin{document}
\begin{enumerate}
\item $\begin{aligned}[t]
x^2 + y^2 &= x^2 + (iy)^2 \\
&= (x + iy) (x - iy)
\end{aligned}$
\item $\begin{aligned}[t]
\frac{1}{n^2-4} &= \frac14 \frac{4}{(n-2)(n+2)} \\
&= \frac14 \left( \frac{1}{n-2}-\frac{1}{n+2} \right)
\end{aligned}$
\end{enumerate}
\end{document}
If you want them horizontally centered as is the default with the align environment you could add an \hfill on either side:
\item \hfill$\begin{aligned}[t]
x^2 + y^2 &= x^2 + (iy)^2 \\
&= (x + iy) (x - iy)
\end{aligned}$\hfill\null
\documentclass{article}
\usepackage{showframe}
\usepackage{amsmath}
\begin{document}
\begin{enumerate}
\item \hfill$\begin{aligned}[t]
x^2 + y^2 &= x^2 + (iy)^2 \\
&= (x + iy) (x - iy)
\end{aligned}$\hfill\null
\item \hfill$\begin{aligned}[t]
\frac{1}{n^2-4} &= \frac14 \frac{4}{(n-2)(n+2)} \\
&= \frac14 \left( \frac{1}{n-2}-\frac{1}{n+2} \right)
\end{aligned}$\hfill\null
\end{enumerate}
\end{document}
Best Answer