title: What is the meaning of slash after the predicate name in Prolog?
body: <p>I've read the SO questions <a href="https://stackoverflow.com/questions/10111625/what-does-slash-do-in-prolog">what does slash(/) do in prolog?</a> and <a href="https://stackoverflow.com/questions/9042879/what-is-the-meaning-of-predicate-simple-1-in-prolog-swi-prolog">What is the meaning of predicate “simple/1” in Prolog (SWI-Prolog)</a>, but these links don't seem to help me.</p>
  
  <p>I was going though some beginner tutorials on Prolog.
  Phrases like <code>Solve/4</code> or <code>Go/1</code> confused me. What does that slash and number mean?</p>