title: Latex expression in R legend
body: <p>What should I do to have R correctly show in a legend the equivalent to this latex expression?</p>
  
  <pre><code>\alpha \leq \beta
  </code></pre>
  
  <p>The following commands handle \alpha and \beta correctly, but not the \leq symbol:</p>
  
  <pre><code>expression(paste(alpha, " leq ", beta))
  
  expression(paste(alpha, " &lt;= ", beta))
  </code></pre>