Enumerate inside align

Question

How can I get an enumerate inside an align environment? I want something like this:

%...
\begin{enumerate}
\item test123
\begin{align*}
\item x^2 & \text{ bla}\\
\item x^3 & \text{ bla2}\\
\end{align*}
\end{enumerate}
%...

Is that possible?

Answer 1

Apparently you can use an align inside an enumerate, as I discovered in this answer to a similar question. Just do something like this:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
 This is an align inside an enumerate.
 \begin{enumerate}
  \item First item.
  \begin{align*}
   f(x) &= x^2
  \intertext{\item Second item.}
   g(x) &= \int_0^\infty t^x x^{n - 1} \, dx
  \end{align*}
 \end{enumerate}
 After the list.
\end{document}

The first \item must be outside the alignment; all the others can be \intertext.

Answer 2

you are using the unnumbered align*, the reason why it makes no real sense to use it inside an enumerate. Maybe this helps:

\documentclass{article}
\usepackage{amsmath}
\begin{document}

\begin{enumerate}
\item test123
\item \hfill$ x^2 \text{ bla}$ \hfill\refstepcounter{equation}(\theequation)
\item \hfill$ x^3 \text{ bla2}$\hfill\refstepcounter{equation}(\theequation)
\item foo
\end{enumerate}

\end{document}