text: Aristotelian logic encompasses a great variety of topics. They include metaphysical theses about 
  ontological categories and problems of scientific explanation. But in a more narrow sense, it is identical 
  to term logic or syllogistics. A syllogism is a form of argument involving three propositions: two 
  premises and a conclusion. Each proposition has three essential parts: a subject, a predicate, and a copula 
  connecting the subject to the predicate.[107] For example, the proposition "Socrates is wise" is made up of 
  the subject "Socrates", the predicate "wise", and the copula "is".[108] The subject and the predicate are the 
  *terms*of the proposition. Aristotelian logic does not contain complex propositions made up of simple 
  propositions. It differs in this aspect from propositional logic, in which any two propositions can be 
  linked using a logical connective like "and" to form a new complex proposition.[109] 
  
  In Aristotelian logic, the subject can be*universal*, 
  *particular*,*indefinite*, or*singular*. For example, the 
  term "all humans" is a universal subject in the 
  proposition "all humans are mortal". A similar 
  proposition could be formed by replacing it with the 
  particular term "some humans", the indefinite term 
  "a human", or the singular term "Socrates".[110] 