text: mathematics, it does not include logical vocabulary relevant to many other topics of philosophical 
  importance. Examples of concepts it overlooks are the contrast between necessity and possibility and the 
  problem of ethical obligation and permission. Similarly, it does not address the relations between past, 
  present, and future.[119] Such issues are addressed by extended logics. They build on the basic intuitions 
  of classical logic and expand it by introducing new logical vocabulary. This way, the exact logical 
  approach is applied to fields like ethics or epistemology that lie beyond the scope of mathematics.[120] 