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I would like to use a multiline equation into an itemized list, but such that the bullet of the list is aligned with the first line of my equation.

The current code I use is like this:

\item $Q_x= Q' \cup D'$
\item \begin{align*}
    \delta_x &= \left\{ \sum_{i=1}^j \ldots\text{~some big formula that spans the entire line~}\ldots\right\} \\
             &\cup  \left\{ \sum_{i=1}^j \ldots\text{~some other big formula that spans the entire line~}\ldots \right\} \\
\item $q^0_x = (q_0, \{s_0\})$

But this yields the following output:

I have also tried to use

\item $\displaystyle\begin{aligned}...\end{aligned}$

But in this case the bullet of the list appears between the two lines:

Any idea how to align the bullet with the first line?

share|improve this question
up vote 10 down vote accepted

I would definitely go the second way with $\displaystyle: I find that it looks strange to have something centered after a bullet. To get the vertical alignment correct, just add [t] after \begin{aligned}, where "t" means "top". (See also the top of page 8 of the User's guide for the amsmath Package.)

share|improve this answer
Thank you for the quick answer. I have used the amsmath documentation several times without ever noticing these [t] and [b] options. – adl Oct 22 '10 at 15:21
By the way, this question is very similar and has an analogous answer. – Hendrik Vogt Oct 22 '10 at 18:32
Is there a way to make the euqation centered as well? – Haikal Yeo Aug 4 '14 at 21:03

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