Does mathjax support math operator \backcong?

[Johannes Chou]

Hi friends,

In the package unicode-math of LaTeX, I have known that there are groups of commands as

 - \sim with \backsim, and

 - \cong with \backcong.

In mathjax, I have found that \sim, \backsim, and \cong are supported. Therefore I wonder, does mathjax support \backcong as well?

I know little about javascript and other tech being used in mathjax, so I just do a stupid search, for "backcong", and "224C" (the hex unicode representation of the symbol I think \backcong will output) in mathjax repo. The result of search seems that the symbol "224C" is supported in many fonts, but the command \backcong is still some distance away from supported.

Here are my questions:

 - Does the newest public version of mathjax support command \backcong?

 - If it supports, then how can I use this command? (should I include some extension manually?)

 - If it does not support, then

     - with what amount of effort can I use this command? or,

     - does mathjax have a plan to support this symbol (maybe with a family of these kinds of symbols) in the future?

Any response and/or comment is welcome.

[Peter Krautzberger]

Hi Johannes,

MathJax's core macros are documented at http://docs.mathjax.org/en/latest/tex.html and \backcong is not supported in the core.

You can define your own macros as documented on that page, e.g., by including $\newcommand{\backcong}{≌}$ in your text or by modifying your MathJax configuration.

> does mathjax have a plan to support this symbol (maybe with a family of these kinds of symbols) in the future?

We currently do not plan to add this particular macro. Please file a feature request at https://github.com/mathjax/mathjax, ideally including a note on which LaTeX package you use for this macro -- feature requests for well-known LaTeX packages are more likely to find community interest.

Regards,

Peter.

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[Johannes Chou]

thx

I will try "add new macro def in config" then.

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