 Abelard [Abailard], Peter |  Albert of Saxony |  Anselm, Saint [Anselm of Bec, Anselm of Canterbury] |  Aristotle, General Topics: logic |  Buridan, John [Jean] |  Burley [Burleigh], Walter |  medieval philosophy |  Ockham [Occam], William |  Peter of Spain [= Petrus Hispanus] |  semiotics: medieval |  square of opposition |  universals: the medieval problem of 