'Given that' in a matrix
Use mathtools
:
\documentclass{article}
\usepackage{mathtools}
\DeclarePairedDelimiterX{\Set}[1]{\lbrace}{\rbrace}{\activatebar #1}
\newcommand{\activatebar}{%
\begingroup\lccode`~=`| \lowercase{\endgroup\let~}\activebar
\mathcode`|="8000
}
\newcommand{\activebar}{\nonscript\;\delimsize\vert\nonscript\;\mathopen{}}
\begin{document}
\[
\Set{n|n>0}
\Set[\big]{n|n>0}
\Set*{n|\begin{matrix} n>0 \\ n<42 \end{matrix}}
\]
\end{document}
Important note: don't use |
for other purposes in the argument of \Set
; it shouldn't be used anyway, preferring \lvert
and \rvert
for the absolute value. Or, of course, with macros based on mathtools
, such as
\DeclarePairedDelimiter{\abs}{\lvert}{\rvert}
Not sure what you have in mind for the dots. Here, I show it with either a matrix
or an aligned
block.
Thanks to egreg for the \middle
reminder.
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
\left\{ n\,\middle| \begin{matrix}2x & y\\3x & 2y\end{matrix}\right\}
\]
\[
\left\{ n\,\middle| \begin{aligned} z &= 2x + y\\z &= 3x - 2y\end{aligned}\right\}
\]
\end{document}