title: Uses of Ackermann function?
body: <p>In our discrete mathematics course in my university, the teacher shows his students the <a href="http://en.wikipedia.org/wiki/Ackermann_function" rel="noreferrer">Ackermann function</a> and assign the student to develop the function on paper.</p>
  
  <p>Beside being a benchmark for recursion optimisation, does the Ackermann function has any real uses ?</p>