<#secure method=smime mode=sign>
>> "rasmus" == rasmus  <Rasmus> writes:

   > Uwe Brauer <oub@mat.ucm.es> writes:

   > Probably not.

   > Note these are Org features irrespective of fragment preview.  There
   > was some talk about it not so long ago.

   > Basically, it just happens that $·$ works as desired most of the time.
   > The proper way in LaTeX as well as in Org is \(·\).  Often you'll find
   > that in challenging cases you're better off with \(·\).



Look the following examples 

> \begin{displaymath}
>  X_{s,\delta}:=H_{s,\delta}\times H_{s,\delta+1}\times H_{s,\delta+1}\times
> H_{s+1,\delta+2}
> \end{displaymath}
org-preview-latex-fragment does not work, change displaymath for
equation, again org-preview-latex-fragment does not work, but 
\[ \] does work, this is odd

>\[
>  X_{s,\delta}:=H_{s,\delta}\times H_{s,\delta+1}\times H_{s,\delta+1}\times
> H_{s+1,\delta+2}
>\]