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# What is MathJax?

MathJax is an exciting new development for rendering $\TeX$ or MathML-coded mathematics in browsers without requiring font installation or browser plug-ins. Any modern browser with javascript enabled will be MathJax-ready. For general information about MathJax, visit mathjax.org.

Below are questions and answers about the use of MathJax on arXiv.

We have enabled MathJax on this help page, article abstract and list pages, the user account page, the submission preview page and search result pages. On these pages, MathJax has been configured to render inline ($-enclosed)$\TeX$only. For example, the expression$P(E) = {n \choose k} p^k (1-p)^{ n-k}$will be rendered as$P(E) = {n \choose k} p^k (1-p)^{ n-k}$. MathML is not supported in arXiv's MathJax configuration. In general, MathJax will only attempt to render$\TeX$in the article title and abstract fields. ### How do I know if MathJax is being used on an arXiv page? MathJax-enabled pages will briefly display a small box to indicate that the MathJax configuration is being loaded, regardless of whether there is any renderable$\TeX$on the page. Valid$\TeX$expressions will be displayed by MathJax as the page is being loaded. On abstract pages, any$\TeX$expressions that MathJax cannot render will be displayed in their original text. On the user account and submission preview pages, rendering errors or unknown macros are displayed in red. For example:$\invalid_TeX$. ### Can I see the underlying$\TeX$coding? Yes, to access the underlying$\TeX$, right- or control-click on a rendered math formula, and choose the format you want from the Format sub-menu. Then select the Show Source menu item to get a pop-up that allows you to copy the math source into another application. To try this feature, visit https://cdn.mathjax.org/mathjax/latest/test/sample-dynamic.html. Alternatively, MathJax can be disabled entirely (see below). ### Can I disable MathJax? Yes, you can disable (and re-enable) MathJax by clicking the following link to set a cookie: When MathJax is disabled, mathematical expressions are displayed as text with the original$\TeX$delimiters. Note that on any particular MathJax-enabled page in arXiv, not all expressions may be renderable. So turning MathJax on or off may have no effect on the visual appearance of certain math expressions. ### As an arXiv submitter, how can I make the best use of MathJax? MathJax supports a very large subset of$\TeX$mathematics, including AMS math and symbols. arXiv's implementation of MathJax does not support user-defined macros. For example, if an abstract contains$\rtwo$as a shortcut for$\mathbf{R}^2$, then MathJax will not be able to render this expression. Submitters should use only standard$\LaTeX$and AMS-$\LaTeX\$ macros in paper titles and abstracts.

Also, since '<' is a reserved character in HTML, special care must be taken in its use. Usually just adding a space after it will suffice for it not to be interpreted as the start of an element name (e.g., 'x < y', not 'x<y'); but if in doubt, use the entity reference '&lt;'.

### Where can I get help regarding MathJax?

The MathJax web site has useful information about browser configuration, fonts, MathJax features, etc. Please see the MathJax documentation and the FAQ if you have questions.

### How do I report a problem?

If you wish to report a problem, or if you have questions about arXiv's use of MathJax, please first visit the contact page.

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