Math & Science ⇒ Multi-line braces

[joewcross]

Hi,

I'm having a problem typesetting a particular piece of a biological protocol. The section is detailing a series of temperatures and times. Three steps of this process are repeated 35 times so I want to enclose these with a large curly brace with "x35" on it. However, I am unable to get a brace to cover multiple lines.

I have tried this:

Code: Select all

\[
	\begin{array}{ll}

	94^{\circ}\mathrm{C} & 2^{\prime} \\
	94^{\circ}\mathrm{C} & 20^{\prime\prime} \\
	T_{anneal} & 30^{\prime\prime} \bigg\} \\
	72^{\circ} & 20^{\prime\prime} \\
	72^{\circ} & 2^{\prime} \\
	
	\end{array}
\]

But the brace simply pads out a single line.

And this:

Code: Select all

\[
	\begin{array}{ll}

	94^{\circ}\mathrm{C} & 2^{\prime} \\
	\left. 94^{\circ}\mathrm{C} & 20^{\prime\prime} \\
	T_{anneal} & 30^{\prime\prime} \\
	72^{\circ} & 20^{\prime\prime} \right\} \\
	72^{\circ} & 2^{\prime} \\
	
	\end{array}
\]

Gives me an error about missing \right or missing delimiter if I remove \left.

I think I may need to use \cases but am unsure how, can anyone help?

Many thanks,

J

[gmedina]

Hi,

to put the bracket to the left, use cases; to put it on the right, use aligned:

Code: Select all

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\[
\left.
\begin{aligned}
   94^{\circ}\mathrm{C} &\phantom{=} 2^{\prime} \\
   94^{\circ}\mathrm{C} &\phantom{=} 20^{\prime\prime} \\
   T_\textup{anneal} &\phantom{=} 30^{\prime\prime} \\
   72^{\circ} &\phantom{=} 20^{\prime\prime} \\
   72^{\circ} &\phantom{=} 2^{\prime} \\
\end{aligned}\right\rbrace \times 35
\]

\[
\times 35
\begin{cases}
   94^{\circ}\mathrm{C} & 2^{\prime} \\
   94^{\circ}\mathrm{C} & 20^{\prime\prime} \\
   T_\textup{anneal} & 30^{\prime\prime} \\
   72^{\circ} & 20^{\prime\prime} \\
   72^{\circ} & 2^{\prime} \\
\end{cases}
\]

\end{document}

[joewcross]

Perfect!

Thank you very much!

J