# [Tex/LaTex] About big parenthesis larger than Bigg

amsmathdelimitersmultlinescaling

Do any one know how to type a very big parenthesis in LaTeX. Since the formula is very big, I used multline environment, in one line, there are many pair of parenthesis by using \left and \right which make them already very big. Between lines, I need some parenthesis bigger than the one given by \Bigg. My intention is to show the following big formula in multline environment:

$$\frac{ e^{-\frac{t \lambda +4}{4 \lambda \nu }} \left( e^{\frac{t}{4 \nu }} \left( 4 \sqrt{\pi } \sqrt{\nu }+1 \right) \nu \Phi \left( \frac{t-\frac{2}{\lambda }}{\sqrt{2} \sqrt{t \nu }} \right) \lambda^3 -e^{\frac{t \lambda +8}{4 \lambda \nu }} \left( 4 \sqrt{\pi } \sqrt{\nu }-1 \right) \nu \left( \Phi \left( \frac{t+\frac{2}{\lambda }}{\sqrt{2} \sqrt{t \nu }} \right) -1 \right) \lambda^3 +e^{\frac{1}{\lambda \nu }} \left( 4 \sqrt{\pi } \lambda^3 \nu^{3/2} \left( 2 \Phi \left( \frac{1}{\sqrt{2} \lambda \sqrt{t \nu }} \right) -1 \right) -e^{\frac{t}{4 \nu }} \left( \left( \lambda \left( 4 \sqrt{\pi } \sqrt{\nu }-1 \right) \nu +2 \right) \lambda^2+2 (\lambda \nu -2) \Phi \left( \frac{\sqrt{\frac{t}{\nu }}}{\sqrt{2}} \right) \lambda^2-2 \right) \right) \right) }{4 \lambda }$$


The ams parenthesis of specific size are typeset by using \left and \right and putting in an invisible "thing" of a certain height to ensure that they are big enough. Mimicking that, you could do: \left(\rule{0cm}{2cm}\right. to get a left parenthesis of 2cm height. Note that the AMS command also adds a little horizontal space which you might need to put in as well. If you do this often, you could easily define new sizes:

\makeatletter
\newcommand{\vast}{\bBigg@{4}}
\newcommand{\Vast}{\bBigg@{5}}
\makeatother


Then in your document:

$\Vast( \frac{\prod_0^\infty k}{\sum_0^\infty n} \Vast)$


produces: I recommend also taking a look at Vertically asymmetric size variation for parentheses about vertically centring parentheses.

(Note I've assumed that you're using amsmath since you tag it with amsmath and the commands \big and so forth are ones that amsmath produces. If you're using a different package to get these commands, then this solution won't work.)