title: org-mode wrongly take * in a math equation as mark of bold font
body: <p>I wrote the following line in org-mode, which contains two equations.</p>
  
  <pre><code>$(Z^{*}_{m}, \cdot m)$  $(Z^{*}_{m}, \cdot m)$
  </code></pre>
  
  <p>But the org-mode didn't identify them as equations. Instead, it highlight the part between the two <code>*</code>s, i.e. <code>}_{m}, \cdot m)$  $(Z^{</code>, making this part bold. Is this a bug of org-mode or my own mistake?</p>
  
  <p>Update: if the braces enclosing the "*" are removed (like below) org-mode can parse it correctly. Strange...</p>
  
  <pre><code>$(Z^*_{m}, \cdot m)$  $(Z^*_{m}, \cdot m)$
  </code></pre>