I would like to know if it is possible to make this. Basically its kind of the opposite from using the {cases} command
Thanks in advance!
[Tex/LaTex] two equations with curly brace
brackets
Related Solutions
Here's a variant of Gonzalo's code that uses \mathop{}\limits instead of \raisebox. The output is almost the same.
\documentclass{article}
\usepackage{mathtools}
\begin{document}
\[
f = \langle x | R\mathclap{\mathop{}\limits_{\overbrace{
\textstyle\int d^3 p |p\rangle \langle p|}}}y
\rangle
\]
\end{document}
If you want something more flexible, use the \braceinsert macro from the code below. It takes one optional argument (the amount by which the brace should be lowered, with default 0ex) and one mandatory argument (the stuff you want under the brace). Moreover, it takes care of the case that the \braceinsert is surrounded by \left...\right delimiters, like this:
To be precise, you'll have to use \bileft...\biright instead of \left...\right (like braceinsert left and right). After the outermost \biright, only explicit superscripts will work, so instead of ' you'd have to use ^\prime. (Subscripts won't work properly, but I don't know when one would want one.)
\documentclass{article}
\usepackage{mathtools}
\setlength{\textwidth}{11cm}
\makeatletter
\newcounter{left@right}
\newcommand*\bileft[1]{\left#1\stepcounter{left@right}}
\newcommand*\biright[1]{\right#1%
\@ifnextchar^{\with@superscript}{\without@superscript}}
\def\with@superscript^#1{^{#1}\without@superscript}
\def\without@superscript{%
\addtocounter{left@right}{-1}%
\ifnum\theleft@right=0
\vphantom{\brace@insert@strut}
\gdef\brace@insert@strut{}
\fi
}
\def\brace@insert@strut{}
\newcommand{\braceinsert}[2][0ex]{%
\def\insert@material{%
\mathop{\rule[-#1]{0pt}{0pt}}\limits_{\overbrace{#2}}%
}%
\expandafter\g@addto@macro\expandafter\brace@insert@strut
\expandafter{\insert@material}
\ifnum\theleft@right>0
\smash{\mathclap{\insert@material}}
\else
\mathclap{\insert@material}
\fi
}
\makeatother
\begin{document}
In the formula
\[
f = 5 \bileft( b^2 + \langle x | R
\braceinsert[0.2ex]{\textstyle\int d^3 p |p\rangle \langle p|}
y \rangle \biright)^2,
\]
the depth of the stuff under the brace is added only \emph{after}
\verb|\biright)^2|.
\end{document}
(Maybe this is wayyy too complicated?)
The following may be close to what you're looking for:
\documentclass[12pt]{article}
\usepackage{amsmath}
\begin{document}
\begin{gather*}
c \colon \{1, \dots, n\} \rightarrow \{1, \dots, n\} \text{ such that}\\
\begin{cases}
c(a_i) = a_{i+1} & \text{for }1\le i<l\\
c(a_l) = a_1
\end{cases}
\end{gather*}
\end{document}
Some comments:
- Use the
casesenvironment, provided by theamsmathpackage, to place a left curly brace ahead of two or more expressions. - Don't use
...to create a typographical ellipsis; instead, use\dots. - Use the
\text{ }command to write text material inside mathematical expressions. - As pointed out in the comments by @SvendTveskæg and @daleif, it's better (typographically speaking) to use the command
\coloninstead of:.
On the other hand, if you need the left-hand curly brace to span all three rows, you could do so with the following code:
\documentclass[12pt]{article}
\usepackage{amsmath}
\begin{document}
\begin{equation*}
\begin{cases}
c \colon \{1, \dots, n\} \rightarrow \{1, \dots, n\} \text{ such that}\\
c(a_i) = a_{i+1} \text{ for $1\le i<l$}\\
c(a_l) = a_1
\end{cases}
\end{equation*}
\end{document}
Observe, though, that this code doesn't make full use of the capabilities of the cases environment; for sure, one could replace \begin{cases} ... \end{cases} with a more basic \left\{\begin{array}{@{}l} ... \end{array}\right. construct.
Best Answer
It is a possible solution of your question.