Transworld Identity

Transworld identity is the thesis that a single individual can exist in more than one possible world. Where David Lewis's counterpart theory holds that modal claims about individuals are really claims about similar counterparts in other worlds, transworld identity holds that the very same person, object, or entity can be found in multiple worlds — stretched across the modal universe like a thread through a tapestry.

The thesis is defended by philosophers including Saul Kripke, who treats names as rigid designators that pick out the same individual regardless of which world we consider. On this view, Aristotle