# Toronto Math Forum

## General Category => General Discussion => Technical Questions => Topic started by: Victor Ivrii on October 21, 2016, 08:34:58 PM

Title: \erf etc
Post by: Victor Ivrii on October 21, 2016, 08:34:58 PM
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
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\newcommand{\erf}{\operatorname{erf}}and now I can use \erf. In Mathjax I place* on the page the same command, surrounded by dollar signs
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$\erf\bigl(\frac{x}{\sqrt{4kt}}\bigr)$

*) Only once