>>> "JK" == John Kitchin <jkitchin@andrew.cmu.edu> writes:

   > I think this is happening here:
   > #+BEGIN_SRC emacs-lisp
   > (org-export-string-as "\\begin{displaymath}
   >   \\int   f dx =0
   > \\end{displaymath}"
   >      'html t )
   > #+END_SRC

Well now this is very odd, I obtain 


#+BEGIN_SRC emacs-lisp
(org-export-string-as "\\begin{displaymath}
  \\int   f dx =0
\\end{displaymath}"
     'html t )
#+END_SRC

#+RESULTS:
: \begin{displaymath}
:   \int   f dx =0
: \end{displaymath}

But org-mime-htmlsize still inserts

<span class="equation-label">
  1
  </span> 
 

I am now very confused and will try to debug it again.