Error "! LaTeX Error: Bad math environment delimiter."

Question

Edit by ManuelKuehner

! LaTeX Error: Bad math environment delimiter.

I am confused how to make the below formula in LaTeX:

I have been trying the below code, but it leads to an error:

\documentclass[runningheads,a4paper]{llncs}

\usepackage{amssymb}
\setcounter{tocdepth}{2}
\usepackage{graphicx}
\usepackage[latin1]{inputenc}
\usepackage[english]{babel}
\usepackage{url}

\usepackage{float}
\usepackage{booktabs}
\usepackage{multirow}% http://ctan.org/pkg/multirow
\usepackage{hhline}% http://ctan.org/pkg/hhline

\usepackage{lipsum}
\setcounter{secnumdepth}{5}
\begin{document}



\begin{equation}
    P(Attack¦Asset)  = \[\frac{\,\ attack,\ asset}\]
\end{equation}

\end{document}

I got ! LaTeX Error: Filellncs.cls' not found.`. Please tell us which error you are getting. — Dr. Manuel Kuehner, Jun 18 '17 at 15:31
Remove \[ and \] from the equation. (And probably you also want to use package amsmath and use \text{...} for the text parts of the equation.) — cgnieder, Jun 18 '17 at 15:34
\frac needs two arguments but you only provided one, that's an additional error. — Skillmon, Jun 18 '17 at 15:59

Dr. Manuel Kuehner · Accepted Answer · 2017-06-18T20:50:05.730

4

Here's a starting point.
Asset and Attack are words and not variables I guess so I used \text from the amsmath package (loaded by mathtools). Both are famous and standard packages for math stuff.
You used \[ and \] inside a math environment -- I guess it's just copy and paste from somewhere. This was an error. See What are the differences between $$, \[, align, equation and displaymath?.

\documentclass{article}

\usepackage{mathtools}

\begin{document}

\begin{equation}
    P(\text{Attack} \mid \text{Asset})  = \frac{P(\text{Attack} \cap \text{Asset})}{P(\text{Asset})}
\end{equation}

\end{document}

I didn't know the funny arc symbol so I looked in detexify.

edited Jun 18 '17 at 20:50

answered Jun 18 '17 at 15:34

Dr. Manuel Kuehner

22,451

2

Probably \mid would look better than |. – Bernard Jun 18 '17 at 15:35
1

You should address the real error in the question, namely using \[ and \] inside equation! – cgnieder Jun 18 '17 at 15:37
@Bernard Done :) – Dr. Manuel Kuehner Jun 18 '17 at 15:37
@clemens I am still typing...but yes – Dr. Manuel Kuehner Jun 18 '17 at 15:38
@Dr.ManuelKuehner you post your answers before you've finished them? o.O – cgnieder Jun 18 '17 at 15:39
@clemens Very often...step by step :) – Dr. Manuel Kuehner Jun 18 '17 at 15:39
You have a "given" instead of "intersection" in the right side of the equation. – gusbrs Jun 18 '17 at 15:42
@gusbrs I have to leave now. Feel free to correct/edit my answer. – Dr. Manuel Kuehner Jun 18 '17 at 15:47
Already corrected. By "intersection" I meant "the funny arc symbol". – gusbrs Jun 18 '17 at 15:48

score 3 · Answer 2 · answered Jun 18 '17 at 15:40

From the mathtools manual mostly.... Note that the spacing is correct everywhere.

\documentclass{article}

\usepackage{mathtools}
\DeclarePairedDelimiter\parens()
\providecommand\given{}
\newcommand\Symbol[1][]{%
    \nonscript\:#1\vert
    \allowbreak
    \nonscript\:
    \mathopen{}}
\DeclarePairedDelimiterX\condr[1](){\renewcommand\given{\Symbol[\delimsize]}#1}


\begin{document}
\[
\Pr\condr{\text{Attack} \given \text{Asset}} = \frac{ \Pr\parens{ \text{Attack} \cap \text{Asset}} }{\Pr\parens{\text{Asset}}}
\]
\end{document}

Error "! LaTeX Error: Bad math environment delimiter."

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