\erf etc

[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

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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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$\newcommand{\erf}{\operatorname{erf}}$and again! $\newcommand{\erf}{\operatorname{erf}}$


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

*) Only once