Equations: Using brackets across "align" command

Question

I have a lengthy function that is messing up:

\begin{align*}
D(a,z) &= \frac{1}{\sqrt{\pi}}2^{\frac{a}{2}}e^{-\frac{z^2}{4}} \left(\cos \left(\frac{\pi a}{2}\right)\Upgamma \left(\frac{a+1}{2}\right) \ {_1F_1}\left(-\frac{a}{2};\frac{1}{2};\frac{z^2}{2}\right) \\
 &+ \sqrt{2}z\sin \left(\frac{\pi a}{2}\right)\Upgamma\left(\frac{a}{2}+1\right) \ {_1F_1}\left(\frac{1}{2}-\frac{a}{2};\frac{3}{2};\frac{z^2}{2}\right) \right)
\end{align*}

The last bracket \right) is not showing up. I think this is because I broke the lines in the middle at &+. Rather than splitting up the function into another set with the term right next to D(a,z)=, would it be possible to get this bracket working? I'm sure it would, I just don't know how.

Thanks!

See https://tex.stackexchange.com/a/173771/15925 – Andrew Swann Sep 26 '18 at 07:55 — Andrew Swann, Sep 26 '18 at 07:55

score 0 · Accepted Answer · answered Sep 26 '18 at 07:16

You can't pair left and right on two separate lines. Just use \left( … \right. and \left. … \right).

You can also use \Bigg

\documentclass{article}
\usepackage{amsmath}

\begin{document}

    With \verb|\left( … \right.| and \verb|\left. … \right)|
    \begin{align*}
    D(a,z) &= \frac{1}{\sqrt{\pi}}2^{\frac{a}{2}}e^{-\frac{z^2}{4}} \left(\cos \left(\frac{\pi a}{2}\right)\Gamma \left(\frac{a+1}{2}\right) \ {_1F_1}\left(-\frac{a}{2};\frac{1}{2};\frac{z^2}{2}\right)\right.\\
    &\left.+ \sqrt{2}z\sin \left(\frac{\pi a}{2}\right)\Gamma\left(\frac{a}{2}+1\right) \ {_1F_1}\left(\frac{1}{2}-\frac{a}{2};\frac{3}{2};\frac{z^2}{2}\right) \right)
    \end{align*}

    With \verb|\Biggl( …\Biggr)|
    \begin{align*}
    D(a,z) &= \frac{1}{\sqrt{\pi}}2^{\frac{a}{2}}e^{-\frac{z^2}{4}} \Biggl(\cos \left(\frac{\pi a}{2}\right)\Gamma \left(\frac{a+1}{2}\right) \ {_1F_1}\left(-\frac{a}{2};\frac{1}{2};\frac{z^2}{2}\right)\\
    &+ \sqrt{2}z\sin \left(\frac{\pi a}{2}\right)\Gamma\left(\frac{a}{2}+1\right) \ {_1F_1}\left(\frac{1}{2}-\frac{a}{2};\frac{3}{2};\frac{z^2}{2}\right) \Biggr)
    \end{align*}

\end{document}

I use \Gamma instead of \Upgamma

Using \left( ... \right. ... \left. ... \right) is generally not advisable as you'll easily end up with () of different sizes. Manual scaling is better. — daleif, Sep 26 '18 at 08:27

Equations: Using brackets across "align" command

1 Answers1