title: NP optimization problems (definition)
body: <p>I'm trying to understand the definition of NPO.</p>
  
  <p>I read the definition here : <a href="http://www.nada.kth.se/~viggo/wwwcompendium/node2.html" rel="nofollow">http://www.nada.kth.se/~viggo/wwwcompendium/node2.html</a></p>
  
  <p>If we consider trying to find a minimal vertice cover, what is I,sol(x) and m ? (goal is min)</p>