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# Getting Started

MathJax allows you to include mathematics in your web pages, either using LaTeX, MathML, or AsciiMath notation, and the mathematics will be processed using javascript to produce HTML, SVG or MathML equations for viewing in any modern browser.

There are two ways to access MathJax: the easiest way is to use the copy of MathJax available from our distributed network service at `cdn.mathjax.org`, but you can also download and install a copy of MathJax on your own server, or use it locally on your hard disk (with no need for network access). All three of these are described below, with links to more detailed explanations. This page gives the quickest and easiest ways to get MathJax up and running on your web site, but you may want to read the details in order to customize the setup for your pages.

## Using the MathJax Content Delivery Network (CDN)

To use MathJax from our server, you need to do two things:

1. Link MathJax into the web pages that are to include mathematics.
2. Put mathematics into your web pages so that MathJax can display it.

You accomplish the first step by putting

    <script type="text/javascript"
      src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
    </script>

into the `<head>` block of your document. (It can also go in the `<body>` if necessary, but the head is to be preferred.) This will load the latest version of MathJax from the distributed server, and configure it to recognize mathematics in both TeX and MathML notation, and ask it to generate its output using MathML if the browser supports that well enough, and otherwise use HTML-with-CSS to display the mathematics. This is one of the most general configurations, and should suffice for most people’s needs. Other configurations are available, however, and you can also provide additional configuration parameters to taylor one of the configurations to your needs. More details can be found in the Loading and Configuring MathJax instructions.

The use of `cdn.mathjax.org` is governed by its terms of service, so be sure to read that before linking to the MathJax CDN server.

To see how to enter mathematics in your web pages, see Putting mathematics in a web page below.

### Secure Access to the CDN

When the the MathJax CDN is accessed via the address `http://cdn.mathjax.org`, data is downloaded over a regular, insecure HTTP connection. This introduces a security risk, since it is possible a hostile 3rd party could intercept the MathJax program data, and replace it. This is sometimes called a man-in-the-middle attack.

To prevent such attacks, it is necessary to access the MathJax CDN over a secure HTTPS connection. This can be done easily by using the following `<script>` tag instead of the one listed above:

    <script type="text/javascript"
      src="https://d3eoax9i5htok0.cloudfront.net/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
    </script>

Currently, the Amazon Cloudfront service used by the MathJax CDN does not support the use of a human-friendly name like `cdn.mathjax.org` for secure connections; however, the address given above is stable and safe to use.

## Installing Your Own Copy of MathJax

We recommend using the CDN service if you can, but you can also install MathJax on your own server, or locally on your own hard disk. To do so you will need to do the following things:

1. Obtain a copy of MathJax and make it available on your server or hard disk.

2. Configure MathJax to suit the needs of your site.
3. Link MathJax into the web pages that are to include mathematics.
4. Put mathematics into your web pages so that MathJax can display it.

### Obtaining and Installing MathJax

The easiest way to set up MathJax is to obtain the v2.0 archive from the MathJax download page (you should obtain a file named something like `mathjax-MathJax-v2.0-X-XXXXXXXX.zip` where the X’s are random looking numbers and letters). This archive includes both the MathJax code and the MathJax webfonts, so it is the only file you need. Note that this is different from v1.0 and earlier releases, which had the fonts separate from the rest of the code.

Unpack the archive and place the resulting MathJax folder onto your web server at a convenient location where you can include it into your web pages. For example, making `MathJax` a top-level directory on your server would be one natural way to do this. That would let you refer to the main MathJax file via the URL `/MathJax/MathJax.js` from within any page on your server.

Note: While this is the easiest way to set up MathJax initially, there is a better way to do it if you want to be able to keep your copy of MathJax up-to-date. That uses the Git version control system, and is described in the Installing MathJax document. If you prefer using Subversion, you can also use that to get a copy of MathJax (see Installing MathJax via SVN).

Once you have MathJax set up on your server, you can test it using the files in the `MathJax/test` directory. If you are putting MathJax on a server, load them in your browser using their web addresses rather than opening them locally (i.e., use an `http://` URL rather than a `file://` URL). When you view the `index.html` file, after a few moments you should see a message indicating that MathJax appears to be working. If not, check that the files have been transferred to the server completely and that the permissions allow the server to access the files and folders that are part of the MathJax directory. (Be sure to verify the MathJax folder’s permissions as well.) Check the server log files for any errors that pertain to the MathJax installation; this may help locate problems in the permission or locations of files.

### Configuring your copy of MathJax

When you include MathJax into your web pages as described below, it will load the file `config/TeX-AMS-MML_HTMLorMML.js` (i.e., the file named `TeX-AMS-MML_HTMLorMML.js` in the `config` folder of the main `MathJax` folder). This file preloads all the most commonly-used components of MathJax, allowing it to process mathematics that is in the TeX or LaTeX format, or in MathML notation. It will produce output in MathML form if the user’s browser supports that sufficiently, and will use HTML-with-CSS to render the mathematics otherwise.

There are a number of other prebuilt configuration files that you can choose from as well, or you could use the `config/default.js` file and customize the settings yourself. The combined configuration files are described more fully in Common Configurations, and the configuration options are described in Configuration Options.

Note: The configuration process changed between MathJax v1.0 and v1.1, so if you have existing pages that use MathJax v1.0, you may need to modify the tag that loads MathJax so that it conforms with the new configuration process. See Installing and Configuring MathJax for more details.

### Linking your copy of MathJax into a web page

You can include MathJax in your web page by putting

    <script type="text/javascript" src="path-to-MathJax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>

in your document’s `<head>` block. Here, `path-to-MathJax` should be replaced by the URL for the main MathJax directory, so if you have put the `MathJax` directory at the top level of you server’s web site, you could use

    <script type="text/javascript" src="/MathJax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>

to load MathJax in your page. For example, your page could look like

    <html>
        <head>
            ...
            <script type="text/javascript" src="/MathJax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
        </head>
        <body>
            ...
        </body>
    </html>

If you have installed MathJax on a server that is in a different domain from the one serving the page that loads MathJax, be sure to read the Notes About Shared Servers for more details. In that case, you may wish to consider using the MathJax CDN rather than installing your own copy of MathJax.

## Putting mathematics in a web page

To put mathematics in your web page, you can use TeX and LaTeX notation, MathML notation, AsciiMath notation, or a combination of all three within the same page; the MathJax configuration tells MathJax which you want to use, and how you plan to indicate the mathematics when you are using TeX notation. The configuration file used in the examples above tells MathJax to look for both TeX and MathML notation within your pages. Other configuration files tell MathJax to use AsciiMath input. These three formats are described in more detail below.

### TeX and LaTeX input

Mathematics that is written in TeX or LaTeX format is indicated using math delimiters that surround the mathematics, telling MathJax what part of your page represents mathematics and what is normal text. There are two types of equations: ones that occur within a paragraph (in-line mathematics), and larger equations that appear separated from the rest of the text on lines by themselves (displayed mathematics).

The default math delimiters are `$$...$$` and `\[...\]` for displayed mathematics, and `\(...\)` for in-line mathematics. Note in particular that the `$...$` in-line delimiters are not used by default. That is because dollar signs appear too often in non-mathematical settings, which could cause some text to be treated as mathematics unexpectedly. For example, with single-dollar delimiters, ”... the cost is $2.50 for the first one, and $2.00 for each additional one ...” would cause the phrase “2.50 for the first one, and” to be treated as mathematics since it falls between dollar signs. For this reason, if you want to use single-dollars for in-line math mode, you must enable that explicitly in your configuration:

    <script type="text/x-mathjax-config">
    MathJax.Hub.Config({
      tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']]}
    });
    </script>
    <script type="text/javascript" src="path-to-mathjax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>

See the `config/default.js` file, or the tex2jax configuration options page, for additional configuration parameters that you can specify for the tex2jax preprocessor, which is the component of MathJax that identifies TeX notation within the page. See the TeX and LaTeX page for more on MathJax’s support for TeX, and in particular how to deal with single dollar signs in your text when you have enabled single dollar-sign delimiters.

Here is a complete sample page containing TeX mathematics (also available in the test/sample-tex.html file):

    <!DOCTYPE html>
    <html>
    <head>
    <title>MathJax TeX Test Page</title>
    <script type="text/x-mathjax-config">
      MathJax.Hub.Config({tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']]}});
    </script>
    <script type="text/javascript"
      src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
    </script>
    </head>
    <body>
    When $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\) and they are
    $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$
    </body>
    </html>

Since the TeX notation is part of the text of the page, there are some caveats that you must keep in mind when you enter your mathematics. In particular, you need to be careful about the use of less-than signs, since those are what the browser uses to indicate the start of a tag in HTML. Putting a space on both sides of the less-than sign should be sufficient, but see TeX and LaTeX support for details.

If you are using MathJax within a blog, wiki, or other content management system, the markup language used by that system may interfere with the TeX notation used by MathJax. For example, if your blog uses Markdown notation for authoring your pages, the underscores used by TeX to indicate subscripts may be confused with the use of underscores by Markdown to indicate italics, and the two uses may prevent your mathematics from being displayed. See TeX and LaTeX support for some suggestions about how to deal with the problem.

There are a number of extensions for the TeX input processor that are loaded by the `TeX-AMS-MML_HTMLorMML` configuration. These include:

- TeX/AMSmath.js, which defines the AMS math environments and macros,
- TeX/AMSsymbols.js, which defines the macros for the symbols in the msam10 and msbm10 fonts,
- TeX/noErrors.js, which shows the original TeX code rather than an error message when there is a problem processing the TeX, and
- TeX/noUndefined.js, which prevents undefined macros from producing an error message, and instead shows the macro name in red.

Other extensions may be loaded automatically when needed. See TeX and LaTeX support for details on the other TeX extensions that are available.

### MathML input

For mathematics written in MathML notation, you mark your mathematics using standard `<math>` tags, where `<math display="block">` represents displayed mathematics and `<math display="inline">` or just `<math>` represents in-line mathematics.

Note that this will work in HTML files, not just XHTML files (MathJax works with both), and that the web page need not be served with any special MIME-type. Also note that, unless you are using XHTML rather than HTML, you should not include a namespace prefix for your `<math>` tags; for example, you should not use `<m:math>` except in a file where you have tied the `m` namespace to the MathML DTD by adding the `xmlns:m="http://www.w3.org/1998/Math/MathML"` attribtue to your file’s `<html>` tag.

Although it is not required, it is recommended that you include the `xmlns="http://www.w3.org/1998/Math/MathML"` attribute on all `<math>` tags in your document (and this is preferred to the use of a namespace prefix like `m:` above, since those are deprecated in HTML5) in order to make your MathML work in the widest range of situations.

Here is a complete sample page containing MathML mathematics (also available in the test/sample-mml.html file):

    <!DOCTYPE html>
    <html>
    <head>
    <title>MathJax MathML Test Page</title>
    <script type="text/javascript"
      src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
    </script>
    </head>
    <body>

    <p>
    When
    <math xmlns="http://www.w3.org/1998/Math/MathML">
      <mi>a</mi><mo>&#x2260;</mo><mn>0</mn>
    </math>,
    there are two solutions to
    <math xmlns="http://www.w3.org/1998/Math/MathML">
      <mi>a</mi><msup><mi>x</mi><mn>2</mn></msup>
      <mo>+</mo> <mi>b</mi><mi>x</mi>
      <mo>+</mo> <mi>c</mi> <mo>=</mo> <mn>0</mn>
    </math>
    and they are
    <math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
      <mi>x</mi> <mo>=</mo>
      <mrow>
        <mfrac>
          <mrow>
            <mo>&#x2212;</mo>
            <mi>b</mi>
            <mo>&#x00B1;</mo>
            <msqrt>
              <msup><mi>b</mi><mn>2</mn></msup>
              <mo>&#x2212;</mo>
              <mn>4</mn><mi>a</mi><mi>c</mi>
            </msqrt>
          </mrow>
          <mrow> <mn>2</mn><mi>a</mi> </mrow>
        </mfrac>
      </mrow>
      <mtext>.</mtext>
    </math>
    </p>

    </body>
    </html>

When entering MathML notation in an HTML page (rather than an XHTML page), you should not use self-closing tags, but should use explicit open and close tags for all your math elements. For example, you should use

    <mspace width="5pt"></mspace>

rather than `<mspace width="5pt" />` in an HTML document. If you use the self-closing form, some browsers will not build the math tree properly, and MathJax will receive a damaged math structure, which will not be rendered as the original notation would have been. Typically, this will cause parts of your expression to not be displayed. Unfortunately, there is nothing MathJax can do about that, since the browser has incorrectly interpreted the tags long before MathJax has a chance to work with them.

The component of MathJax that recognizes MathML notation within the page is called the mml2jax extension, and it has only a few configuration options; see the `config/default.js` file or the mml2jax configuration options page for more details. See the MathML page for more on MathJax’s MathML support.

### AsciiMath input

MathJax v2.0 includes a new input format: AsciiMath notation. For mathematics written in this form, you mark your mathematical expressions by surrounding them in “back-ticks”, i.e., ``...``.

Here is a complete sample page containing AsciiMath notation (also available in the test/sample-asciimath.html file):

    <!DOCTYPE html>
    <html>
    <head>
    <title>MathJax AsciiMath Test Page</title>
    <script type="text/javascript"
      src="../MathJax.js?config=AM_HTMLorMML-full"></script>
    </head>
    <body>

    <p>When `a != 0`, there are two solutions to `ax^2 + bx + c = 0` and
    they are</p>
    <p style="text-align:center">
      `x = (-b +- sqrt(b^2-4ac))/(2a) .`
    </p>

    </body>
    </html>

The component of MathJax that recognizes asciimath notation within the page is called the asciimath2jax extension, and it has only a few configuration options; see the `config/default.js` file or the asciimath2jax configuration options page for more details. See the AsciiMath support page for more on MathJax’s AsciiMath support.

## Where to go from here?

If you have followed the instructions above, you should now have MathJax installed and configured on your web server, and you should be able to use it to write web pages that include mathematics. At this point, you can start making pages that contain mathematical content!

You could also read more about the details of how to customize MathJax.

If you are trying to use MathJax in blog or wiki software or in some other content-management system, you might want to read about using MathJax in popular platforms.

If you are working on dynamic pages that include mathematics, you might want to read about the MathJax Application Programming Interface (its API), so you know how to include mathematics in your interactive pages.

If you are having trouble getting MathJax to work, you can read more about installing MathJax, or loading and configuring MathJax.

Finally, if you have questions or comments, or want to help support MathJax, you could visit the MathJax community forums or the MathJax bug tracker.

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