8

Type the following in a *Mathematica* DisplayFormula cell(other styles may also encounter this problem):
`Esc`+`$l$`+`|`+`Esc` and `Esc`+`$r$`+`|`+`Esc`, and save as LaTeX.

## Note: See the difference of the character between | |.

$z$ and $z_1$, $|z|$, $|z_1|$

```
Cell[BoxData[
RowBox[{"\[LeftBracketingBar]",
SubscriptBox["z", "1"], "\[RightBracketingBar]"}]], "DisplayFormula"]
```

with subscript, then...

*Mathematica* inserts extra `\left`

and `\right`

for absolute values in the LaTeX output:

```
%% AMS-LaTeX Created by Wolfram Mathematica 9.0 : www.wolfram.com
\documentclass{article}
\usepackage{amsmath, amssymb, graphics, setspace}
\newcommand{\mathsym}[1]{{}}
\newcommand{\unicode}[1]{{}}
\newcounter{mathematicapage}
\begin{document}
\[
\left\left| Z_1+Z_2\right\right| \leq \left\left| Z_1\right\right| +\left\left| Z_2\right\right|
\]
\end{document}
```

What should I do to get valid output that LaTeX will accept?

2Please provide the original code that was converted and some info on how this was done to clarify your question and enable reproduction. – Yves Klett – 2013-07-28T09:43:41.893

@YvesKlett here, http://mathematica.stackexchange.com/questions/29314/choose-the-use-of-vertical-bar-indicate-absolute-value

– HyperGroups – 2013-07-28T11:36:18.3531My preference is to have self-contained questions / MWEs... – Yves Klett – 2013-07-28T11:43:24.137

@YvesKlett fine,,,since this question was asked in Tex.SE,...and that was asked in Math.SE...You can type Esc l|Esc and Esc r| Esc in one

`DisplayFormula`

cell. – HyperGroups – 2013-07-28T12:09:44.937