I've run into this exact problem before; it seems that \mathbb works by
default for html builds, but not for latexpdf. It's an easy fix though, you
just need to make sure that the amsmath and/or amssymb packages are loaded
during the latex preamble, i.e., change the 'latex_preamble' line in your
conf.py to the following:

# Additional stuff for the LaTeX preamble.
latex_preamble = '\usepackage{amsmath,amssymb}\n'

Jack

On Thu, Nov 10, 2011 at 6:37 PM, Yoshifumi YAMAGUCHI
<ymotong...@gmail.com>wrote:

> Hi Daniele,
>
> Can you provide detailed infomation about the issue, such as error
> message, generated HTML, screenshot
>  and so on, so that we can help you.
>
> If you got no error message, there may not be straight forward work
> arounds.
>
> Cheers,
> Yoshi
>
> On 2011/11/11, at 7:18, daniele <daniele.zambe...@gmail.com> wrote:
>
> > why
> >
> > .. math::
> >
> >   \mathbb{N}
> >
> > not work properly?
> >
> >
> > Thanks for your help,
> >
> > Daniele
> >
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