[Tex/LaTex] How to type error function in LaTeX math environment

math-modesymbols

Possible Duplicate:
Define additional math operators to be typeset in roman

It may be a very simple question to people who know.

If I want to type commonly used functions like exponential function exp(x) or sinusoidal function sin(x), I use \exp(x) and \sin(x) in LaTeX and the results looks nice (fonts become different from other non-function characters). However, when I type error function \erf(x), it gives me error messages. If I remove \, it compiles fine but the "erf(x)" fonts just look the same to other non-function characters. Could anyone please tell me how to make the error function fonts look like as exponential function in a math environment? Thanks very much.

Best Answer

\DeclareMathOperator\erf{erf}

not every command imaginable are defined by default (assumes amsmath of course)

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[Tex/LaTex] Formatting of other special functions

There is no standard, that covers all math functions. Some functions are written in a different way, but even than there are several ways to do this. For example the indicator function can be written with a

bold 1: 𝟏
double struck 1: 𝟙
bold, upright I: 𝐈
double struck, upright I: 𝕀
italic I: 𝐼

I don't know about ISO, but the German standard, DIN1302, defines the Heaviside function as either 𝐻 or ε and rect(x), tri(x), sinc(x) and inv(x) in upright math.

[Tex/LaTex] Error “! LaTeX Error: Bad math environment delimiter.”

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.

Best Answer

Related Solutions

[Tex/LaTex] Formatting of other special functions

[Tex/LaTex] Error “! LaTeX Error: Bad math environment delimiter.”

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