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Dafür gibt es ein Paket `mleftright`. Aus der Dokumentation
> The package is a result of a thread in the newsgroup `comp.text.tex` with the subject
*spacing after `\right)` and before `\left(`* [[1](http://groups.google.com/group/comp.text.tex/msg/e5b6833da7dc29bf)]. The problem: `\left` and `\right` adjust the size of the delimiters automatically. However, TeX treats the whole expression
as inner formula. In some circumstances TeX adds extra space before or after an inner formula.
\documentclass{article}
\usepackage{mleftright}
\mleftright
\newcommand*{\PunktA}[3][]{\ensuremath{#1({#2}\,|\,{#3})}}
\newcommand*{\PunktB}[3][]{\ensuremath{#1\left({#2}\,\middle|\,{#3}\right)}}
\begin{document}
\PunktA[W]{3}{5}
\PunktA[W]{3}{\frac{1}{2}}
\PunktB[W]{3}{5}
\PunktB[W]{3}{\frac{1}{2}}
\end{document}\end{document}
[![alt text][1]][1]
[1]: https://texwelt.de/wissen/upfiles/test_451.png
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Dafür gibt es ein Paket `mleftright`. Aus der Dokumentation
> The package is a result of a thread in the newsgroup `comp.text.tex` with the subject
*spacing after `\right)` and before `\left(`* [[1](http://groups.google.com/group/comp.text.tex/msg/e5b6833da7dc29bf)]. The problem: `\left` and `\right` adjust the size of the delimiters automatically. However, TeX treats the whole expression
as inner formula. In some circumstances TEX TeX adds extra space before or after an inner formula.
\documentclass{article}
\usepackage{mleftright}
\mleftright
\newcommand*{\PunktA}[3][]{\ensuremath{#1({#2}\,|\,{#3})}}
\newcommand*{\PunktB}[3][]{\ensuremath{#1\left({#2}\,\middle|\,{#3}\right)}}
\begin{document}
\PunktA[W]{3}{5}
\PunktA[W]{3}{\frac{1}{2}}
\PunktB[W]{3}{5}
\PunktB[W]{3}{\frac{1}{2}}
\end{document}
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