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    ## This short example supports [MathJax](http://www.mathjax.org/)

    <p style="font-size:x-large;">
    Inline equations, as for instance the classic $\Delta = b^2-4ac$ and
    $x\_{1,2} = \frac{-b\pm\sqrt{\Delta}}{2a}$, or display equations as this one :
    	$$ J\_\alpha(x) = \sum\limits\_{m=0}^\infty \frac{(-1)^m}{m! \, \Gamma(m + \alpha + 1)}{\left({\frac{x}{2}}\right)}^{2 m + \alpha} $$
    </p>

    ## From a classic math book
    But a less classic exercise about [Hölder functions](https://en.wikipedia.org/wiki/H%C3%B6lder_condition)
    (more precisely, *Exercice 7*, Chapter 4.5, page 267, of the [Gourdon, "*Les maths en tête : Analyse*", $2^\text{nd}$ edition](http://www.amazon.fr/gp/product/2729837590) book).

    <p style="font-size:x-large;">
    $$ 4 \sum\_{n=1}^{+\infty} \rho\_n^2 \sin^2 nh = \frac{1}{2\pi} \int\_{-\pi}^{\pi}\lvert f(x+h) - f(x-h)\rvert^2 dx. $$
    </p>

    ## How-to ?
    The previous equation is simply included in the Markdown code part as basic some $\LaTeX2e{}$ code :

    > ```latex
    $$ 4 \sum\_{n=1}^{+\infty} \rho\_n^2 \sin^2 nh = \frac{1}{2\pi} \int\_{-\pi}^{\pi}|f(x+h) - f(x-h)|^2 dx. $$
    ```

    ***

    ## Yes, it is as simple as adding *one line at the bottom*
    You just have to load [MathJax](http://www.mathjax.org/) (as described [here](http://docs.mathjax.org/en/latest/configuration.html))
    from the bottom of a *StrapDown*-flavored page, for instance from the default *CDN* :

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

    You can consult [a second example](example4.html) to see some more advanced examples of LaTeX equations rendered with MathJax.

    ### A better solution?
    From version 0.5, you can import MathJax in an even *quicker* way: you just have to add ``&mathjax=yes`` to the URL used to import [``strapdown.min.js``](index.html).
    See [the first paragraph of this third example](example5.html) to see this.

    ***

    # Warning
    Be aware of the following limitations :

    ## Escape the underscore ('``_``')
    The [StrapDown.js](//lbesson.bitbucket.org/md/index.html) text processor interprets
    underscores (the '``_``' symbol) as underline markup (like _this_),
    so be sure to escape the '``_``' in the $\LaTeX2e{}$ code.

    A *bad looking* example could be ``$\mathcal{M}_{n,m}(\mathbb{F_9})$``
    (which is **badly displayed** as $\mathcal{M}_{n,m}(\mathbb{F_9})$). _Ugly_ right ?

    Escape the '``_``' in the previous code to get ``$\mathcal{M}\_{n,m}(\mathbb{F\_9})$`` :
    now it is **nicely displayed** as $\mathcal{M}\_{n,m}(\mathbb{F\_9})$.

    ## Escape some others Markdown markup code ('``*``', '``**``' or '``#``')
    The previous limitation is also true for other symbols, used for *Markdown as markup* and for *LaTeX as symbols*.

    An example could be ``$[ u^*; v^*](x)$`` (which is badly displayed as $[ u^*; v^*](x)$),
    which becomes ``$\[ u^\*; v^\*\]\(x\)$`` (now it is nicely displayed as $\[ u^\*; v^\*\]\(x\)$).

    A pretty good rule of thumb can be to **escape every Markdown markup symbols** in LaTeX code.
    Feel free to refresh your mind about which symbols are used as elements of the Markdown syntax
    with [this page](http://daringfireball.net/projects/markdown/syntax#list),
    or [this one on Wikipedia](https://en.wikipedia.org/wiki/Markdown).

    ## Escape the backslash ('``\``')
    The backslash symbol, already escaped by an backslash ('``\``')
    is used in LaTeX to force a new line. It is usually used in aligned equations,
    as shown in the Lorenz Equations [here](example4.html).

    You should also escape the backslash, by typing ``\\`` where you would have
    used a simple ``\`` in LaTeX.

    ***

    ## See also
     + [This page](http://perso.crans.org/besson/math.html) shows how to use MathJax on a [Sphinx](http://sphinx-doc.org/) project.
     + [This script (strapdown2pdf)](strapdown2pdf.html) to print to PDF a *StrapDown*-powered web page.
    It comes with a limited support of LaTeX (still not perfect).

    ---

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