The only thing that is possible is what actually happened.
Not true, for MWI believers. You experienced only one thing, but other possible things happened in other universes. In that conception, it’s quite sane to talk about “possible counterfactual” as distinct from “impossible”. Possible means “happens in at least one timeline”, where impossible means “logically contradictory”.
Note that this doesn’t change your conclusion—uncertainty is still about your knowledge. It’s just about your knowledge of what happens in your timeline, as well as your knowledge of which timeline you’re in.
Yeah, given the tendency of multi-world to complicate things I usually ignore it and leave it up to others to figure out how to adapt my arguments to this theory.
Not true, for MWI believers. You experienced only one thing, but other possible things happened in other universes. In that conception, it’s quite sane to talk about “possible counterfactual” as distinct from “impossible”. Possible means “happens in at least one timeline”, where impossible means “logically contradictory”.
Note that this doesn’t change your conclusion—uncertainty is still about your knowledge. It’s just about your knowledge of what happens in your timeline, as well as your knowledge of which timeline you’re in.
Yeah, given the tendency of multi-world to complicate things I usually ignore it and leave it up to others to figure out how to adapt my arguments to this theory.