• For Aristotle, logic is a syllogism between categorical and invalid-conditional
• Aristotle divides Being in ten cathegories, that are: accident (quality, quantity, relation, where, when, action passion, posture) and substance that is prime motor and substantial form 
• The herarchy of being has a pyramidal gerarchy that starts from mineral level, vegetative level, animal level, human level.

Fresco, Trevisano, De Giorgi, Guido