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## Bracket size proble: Split multi-line equations

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### Bracket size proble: Split multi-line equations

I have a long equation split into two lines and a large '(' bracket surrounding some parts of equation is also separated, i.e. \left( is in the upper line and \right) is in the lower line. In that case \left( resizes according to its contents but \right) doesn't resize and it is not even displayed. I am using AmsMath package and I know that it is better to use \Bigg commands, however even the largest \Bigg is much smaller than my equation's contents.

Code: Select all  •  Open in writeLaTeX
\begin{align}P &= some equation \\&= \left( firstPart \\   &{} + secondPart \right)\end{align}

\left( displays big enough but \right) is not even displayed
Last edited by cgnieder on Mon Dec 10th, 2012, edited 1 time in total.
denizkartan

Posts: 1
Joined: Fri May 15th, 2009

### Re: Bracket size proble: Split multi-line equations

Hi!

I know of a brute-force way of doing this, for instance:

Code: Select all  •  Open in writeLaTeX
\begin{align*}    \left( ---first line of the equation--- \right.\\    \left. ---second line of the equation---\right)\end{align*}

This works whenever the first and second lines have similar vertically-spaced stuff. For example, if the first line has a summation and the second line has only greek letters, then the \right)' will appear a normal )' and not a large one. I usually insert a \vphantom{\sum} in the second line somewhere between the \left.' and \right)' to get the parentheses to match each other.

Perhaps someone in this forum can suggest a cleaner way.

Best regards,
- D.
Last edited by cgnieder on Mon Dec 10th, 2012, edited 1 time in total.
dnemoc

Posts: 19
Joined: Mon May 11th, 2009

### Re: Bracket size proble: Split multi-line equations

You can manually adjust the size of the delimiters, as shown here:
Code: Select all  •  Open in writeLaTeX
\begin{align*}    \Bigl( ---first line of the equation--- \\           ---second line of the equation---\Bigr)\end{align*}

Use one of the following pairs: \bigl-\bigr, \Bigl-\Bigr, \biggl-\biggr, \Biggl-\Biggr.
Last edited by cgnieder on Mon Dec 10th, 2012, edited 1 time in total.
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Juanjo

Posts: 656
Joined: Sat Jan 27th, 2007

### Re: Bracket size proble: Split multi-line equations

I had the same problem, but with more than just one bracket. I also tried to combine the {split}- to the {align}-environment, but it didn't work. So I used the \right. solution this time. But this problem will come back soon. So I would be glad about a solution without counting how many \right. I have put in. Anybody got an idea?

Best regards J
Last edited by cgnieder on Mon Dec 10th, 2012, edited 1 time in total.
jakob_s

Posts: 1
Joined: Tue Jun 2nd, 2009

### Re: Bracket size proble: Split multi-line equations

have a look at the breqn package.
phi

Posts: 578
Joined: Tue Oct 21st, 2008

### Re: Bracket size proble: Split multi-line equations

The trick I've used makes use of a vertical placed underbrace. At this way you can specify a braces height manually. It took me a while to come up with a way, so hopefully this will be able to help somebody.

The code below produces a bracket of 1.5cm height.

Code: Select all  •  Open in writeLaTeX
\usepackage{rotating}\begin{sideways}\parbox{1.5cm}{$\underbrace{\hspace{1.5cm}}$}\end{sideways}
Last edited by cgnieder on Mon Dec 10th, 2012, edited 1 time in total.
martinvb

Posts: 1
Joined: Wed Nov 24th, 2010

### Re: Bracket size proble: Split multi-line equations

use the \left and \right commands before the brackets..

here is an example:
Code: Select all  •  Open in writeLaTeX
AC(T_i) = \left\{ S_i + h_i \sum_{j=R}^{R+T_i-1} (j-R) d_{ij}\right\}/T_i
Last edited by cgnieder on Mon Dec 10th, 2012, edited 1 time in total.
mitesh_century

Posts: 1
Joined: Sun Nov 28th, 2010

### Re: Bracket size proble: Split multi-line equations

You may also use the method of creating a phantom object as suggested at http://en.wikibooks.org/wiki/LaTeX/Adva ... formatting under "Braces spanning multiple lines".
tekkerchrede

Posts: 3
Joined: Sun Jan 17th, 2010