# Remembering and Duplication

Given my previous post on the relationship between remembering and truth, there are some interesting offshoots. Let’s look at an example. Suppose we have a duplicator machine that, well, makes duplicates of anything you want. Let’s say we have Saul Kripke stand in the place where the model is supposed to be and the duplicator machine duplicates Kripke. Call the model Kripke(1) and the duplicate Kripke(2). Suppose Kripke(1) and Kripke(2) wander off and we lose track of them. Later on, we find them both and put them in an interrogation room. Assume that they have not forgotten anything in the meantime. Is there anyway to tell which one is Kripke(1) and which one is Kripke(2)? In fact, a simple way is related to remembering things. So we administer truth serum to them that makes them tell the truth 100% of the time. Now, since a necessary condition of remembering something is that the thing is true, we can ask the following question: do you remember being the model for the duplicator machine? Only Kripke(1) can answer in the affirmative and so we have discovered which person is Kripke(1) and which person is Kripke(2).