title: Writing Latex in Ipython output
body: <p>Consider the following lines in a IPython notebook:</p>
  
  <pre><code> B=1.0e5   # in Gauss
   fce = 1.80e6 * B
   print "Electron gyrofrequency $f_{ce}$= %0.5e " %(fce)
  </code></pre>
  
  <p>I cannot get $f_{ce}$ to print in its latex form. I also tried:</p>
  
  <pre><code>     from IPython.display import display, Math, Latex 
       display ("Electron gyrofrequency" + Math(r'f_{ce}') + "= %0.5e " %(fce))
  </code></pre>
  
  <p>I got an error:</p>
  
  <pre><code> TypeError: cannot concatenate 'str' and 'Math' objects
  </code></pre>