# User:Mathmensch/Playground

## middle

wanted:

$\displaystyle \left\{x \in A \middle| x > 0\right\}$

what currently works:

${\displaystyle \left\{x\in A|x>0\right\}}$
However the middle delimiter does not grow with the arguments. This is wanted in some cases, i.e. see https://tex.stackexchange.com/questions/108388/how-to-automatically-scale-mid-within-delimiters?noredirect=1

A workaround is to use the \Bigg etc

${\displaystyle {\Biggl \{}f\in {\mathcal {C}}^{\infty }(\mathbb {R} ^{n}){\Bigg |}\forall \alpha ,\beta \in \mathbb {N} _{0}^{n}:\left\|x^{\alpha }{\frac {\partial ^{\beta }}{\partial x^{\beta }}}f\right\|_{\infty }<\infty {\Biggr \}}}$

\Biggl\{
f \in \mathcal C^\infty(\mathbb R^n)
\Bigg|
\forall \alpha, \beta \in \mathbb N_0^n: \left\| x^\alpha \frac{\partial^\beta}{\partial x^\beta} f \right\|_\infty < \infty
\Biggr\}


### Longrightarrow

Workaround

${\displaystyle 0\,{\xrightarrow {f}}\,A\,{\xrightarrow {\ g\ }}\,B\,{\xrightarrow {\;\;h\;\;}}\,C\,{\xrightarrow {\quad i\quad }}\,D\,{\xrightarrow {\quad }}\,0}$

0\, \xrightarrow{f}\, A\, \xrightarrow{\ g\ }\, B\, \xrightarrow{\;\;h\;\;}\, C\, \xrightarrow{\quad i\quad}\, D\, \xrightarrow{\quad}\, 0


## other

${\displaystyle {\widehat {abcdefg}}}$
$\displaystyle \strokedint$
$\displaystyle \intbar$