#enumerateequationslistsvertical alignment
I'm trying to have an equation as the first line of one of my items in an enumerate environment.
Example:
\begin{enumerate}
\item \[ x \]
\end{enumerate}
I want the $x$ to have the same baseline as the 1., but it's appearing lower. How can I make the two line up properly?
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}
A little example with the multienum package:
\documentclass{article}
\usepackage{multienum}
\begin{document}
\begin{multienumerate}
\mitemxxxx{First}{Second}{Third}{Fourth}
\mitemxxxx{Fifth}{Sixth}{Seventh}{Eigth}
\end{multienumerate}
\end{document}
Since multienum internally uses a \hsize length set to \textwidth, the results obtained inside other environments (lists like enumerate, for example) might not be as expected. This can be fixed by setting \hsize to \linewidth. The following example illustrates the problem and the solution:
\documentclass{article}
\usepackage{multienum}
\begin{document}
\begin{enumerate}
\item First item with a standard \verb!multienumerate!:
\begin{multienumerate}
\mitemxxxx{First}{Second}{Third}{Fourth}
\mitemxxxx{Fifth}{Sixth}{Seventh}{Eigth}
\end{multienumerate}
\end{enumerate}
\begin{enumerate}
\setlength\hsize{\linewidth}
\item First item with a modified \verb!multienumerate!:
\begin{multienumerate}
\mitemxxxx{First}{Second}{Third}{Fourth}
\mitemxxxx{Fifth}{Sixth}{Seventh}{Eigth}
\end{multienumerate}
\end{enumerate}
\end{document}
Best Answer
doesn't really make sense, from my point of view.