• identity theory ( 2 types ) 
• type - type 
• token - token 
• 1-to1
• a 1 to 1 correspondence in which each member for one set has a corresponding member for the other member 
• sean has the same belief but his brain state may be different from my brain state 
• physicalism
• there is a difference between the type- type state  and the token-token state: jerry foder 
• gresham's law 
• if there is a lot of conterfit money there is less confidence in the money 
• physical account book
• if you ask is there a physical kind called money
• with money there is only a token-token
• decartes- the mind is a thing that is thinking 
• i am thinking about paris 
• folk psychology is fundamentally wrong 
• you is second person
• I has a unity of mind and body 
• does conciousness make a difference