title: Why is it necessary to put #' in some cases in Lisp?
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/4873810/what-does-mean-in-lisp">What does # mean in LISP</a>  </p>
  </blockquote>
  
  
  
  <p>I am learning lisp, but one thing I do not understand is why it is necessary for #' to be used. If a function with a specific name exists, why would lisp think its a variable?
  Ex:</p>
  
  <pre><code>&gt;(remove-if-not #'evenp '(1 2 3 4 5 6 7 8 9 10))
   (2 4 6 8 10)
  </code></pre>