General Category > Technical Questions

\erf etc

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Victor Ivrii:
Definitely $erf$ should be printed upright, like $\sin$ and so on. Unfortunately LaTeX and standard packages do not know this command (macro) \erf. Neither does MathJax with standard extensions. But there is mechanism: I place* in the preamble of the LaTeX document

--- Code: ---\newcommand{\erf}{\operatorname{erf}}
--- End code ---
and now I can use \erf. In Mathjax I place* on the page the same command, surrounded by dollar signs

--- Code: ---$\newcommand{\erf}{\operatorname{erf}}$
--- End code ---
and again! $\newcommand{\erf}{\operatorname{erf}}$

$\erf\bigl(\frac{x}{\sqrt{4kt}}\bigr)$

*) Only once