title: How do I print greek letters in jupyter
body: <p>If I say </p>
  
  <pre><code>plt.title(r'$\tau$')
  </code></pre>
  
  <p>or</p>
  
  <pre><code>plt.xlabel(r'$\tau$')
  </code></pre>
  
  <p>In <code>jupyter</code> notebook, I get the greek letter tau.</p>
  
  <p>How do I do the same for just text?</p>
  
  <p>This doesn't work:</p>
  
  <pre><code>print(r'$\tau$', tau)
  </code></pre>