title: Finding a relationship without knowing the operators?
body: <p>1 + 2 + 3 = 6 is a simple equation, but let's say you have something like this:</p>
  
  <p>1 ? 2 ? 3 = 6</p>
  
  <p>How do you find the operators? Is it possible?</p>
  
  <p>I've experimented a bit with gplearn in Python but it seems like you need to know at least some of the operators beforehand to use it properly. Also, is this what symbolic regression is used for?</p>