title: Haskell class Num not contained in Ord?
body: <p>I was reading <a href="http://learnyouahaskell.com/recursion" rel="noreferrer">LYAH</a> and read that the Num class isn't a subset of Ord. This means that there is a Num type which is not a member of Ord, what could constitute such a type?</p>
  
  <blockquote>
    <p>Note: Num is not a subclass of Ord. That means that what constitutes
    for a number doesn't really have to adhere to an ordering. So that's
    why we have to specify both the Num and Ord class constraints when
    doing addition or subtraction and also comparison.</p>
  </blockquote>
  
  <p>Thanks!</p>