A duplicate of you is not you.

For every property F, subject x has F if and only if subject y has F, then x is identical to y. EveryF(Fx <-> Fy) -> x=y. If x and y differentiate then there is at least one property that x has and y does not, or vice versa. http://en.wikipedia.org... (Leibniz Law {LL}). The methods of the copying are unimportant, advanced technology, magic; all give rise to the outcome of 'a perfect copy.' If we imagine person A's life as being a film, at the moment of copying, the copy is not just an image spliced from the film, the image contains all instances and processes, the entire film, up to the moment of copy. At the instant of copy, both copies are identical, both contain the same thought processes, knowledge, cellular chemistry etc. If the person at moment of copy was just prior to a sneeze, both entities after copy would sneeze. A photo of person A represents A while not being A. That is, we can say 'this is not person A, but is a version of some recognisable properties of A.' The photo is not a copy, has few properties contingent with person A but retains elements that allow it to be clearly identified as 'this person is A.' The photo is not a copy of person A, though it can be identified as person A. A photo of person A as a child and one as an adult do not give rise to an easily identified 'this is person A in both photos,' even though it is a photo of the same person. That is, at time t for the child's photo and time t~ for the adult, person A will have separate properties, whilst being consistent of 'this is person A.' Discrete properties at t and t~ are not incompatible with LL since properties related to time t and not being so related to t~ are compatible conditions i.e. person A holding of properties at t and t~ do not occupy the same space within the same time. == "My argument is that there is no way in which you can possibly experience life as the duplicate after having been the original - therefore, that guy over there is not me." Irrelevant as to the experiences any one of the copies has. Remember the resolution is: "A duplicate of you is not you." The duplicate is identical in all aspects to the original, including all prior thought instances. It does not matter who experiences what scenario, the copy and the original would both act in the exact same manner. Much like the child will not currently have the same experiences as their later self; experiences at time t and t~ are not self sufficient clauses of discerning a self from themselves. "If while I slept in my bed at home here on Earth, an alien being on a planet in the Andromeda Galaxy made a perfect duplicate copy of me from scratch, I would still be asleep in bed on Earth, unaware a copy of me existed on the alien's planet in that other galaxy. Nothing would have changed in my life from my point of view. I would have no connection to that version of or likeness of me, nor would he be me - as I am here, on Earth, in my bed, asleep." A child has no connection with their future self, no instance of recognition at a future self, for example, 20 years in the future, no instances of thought, action or process from their present state to any future state, yet they are still the same person. Not having the same experiences at time t and t~ is not a sufficient clause. "If that same alien on the planet in the Andromeda galaxy used a transporter/teleporter, which scanned and mapped every particle that my body was composed of, then recorded and retrieved that information and at his end used it to construct a new version of me from different atoms without harming me in any way, I would still be asleep here on Earth and not be aware of any such activity having taken place." It is analogous to stating every time cell division occurs within your body, you become an instant non-you because the you prior to that instance of cell division had no capacity to know all future instances of what occurs to you. "If that same alien on the planet in the Andromeda galaxy used a transporter/teleporter, which scanned and mapped every particle that my body was composed of, YET DESTROYED MY BODY in the instantaneous process of the reading and mapping of my atoms via disintegration, then at his end used the mapped information to construct a new version of me from different atoms, I would be dead and gone, and a duplicate copy of me would have taken my place." You do not however answer what exactly, is not you about a perfect representation of you. If there is no instance of differentiation, what is different? "I, the original me, would be dead even if that alien used all the original atoms I was composed of to reconstruct me." Even worse now; the same atoms, in a perfect instance of you, are not you? How exactly?