As I understand from above, in SIA the real reference class is “the class of observers who is subjectively indistinguishable from me” - and that is why SIA doesn’t depend on any other reference classes which I could be a member. However, it doesn’t exclude the use of SSA logic for SSA-related conclusions.
An example of SSA logic: I am a member of a class of people who was born between equator and a pole of Earth, and by the fact of my birth I was randomly selected from this class. Thus, the place of my birth should be rather randomly (but accounting for different population densities) selected between equator and pole, and unlikely to be exactly on the equator or on the pole. I was born at 55 latitude, so SSA logic work in predicting my latitude of birth.
I could be a member of many different SSA-classes and for each of them make independent predictions about my position in them.
For SIA the class of “subjectively indistinguishable” my copies could be also not very exact. Different interpretation of such class is:
1) everybody is me who have the same thought process as me now. There could be a lot of them, even on Earth.
2) everybody, who has the total sum of all visual (and other) experiences as me, even despite the fact that I will not be able to account for all differences as they are too small to account.
3) everybody who has exactly the same brain as me. This class hundred orders of magnitude more rare than (2), as the same experience could be generated by different brains.
I think that “true” SIA class is somewhere between (1) and (2) - or more likely, there is no “true SIA class”, the same way as there is no true SSA-class, and different types of SIA could be used to answer different questions.
As I understand from above, in SIA the real reference class is “the class of observers who is subjectively indistinguishable from me” - and that is why SIA doesn’t depend on any other reference classes which I could be a member. However, it doesn’t exclude the use of SSA logic for SSA-related conclusions.
An example of SSA logic: I am a member of a class of people who was born between equator and a pole of Earth, and by the fact of my birth I was randomly selected from this class. Thus, the place of my birth should be rather randomly (but accounting for different population densities) selected between equator and pole, and unlikely to be exactly on the equator or on the pole. I was born at 55 latitude, so SSA logic work in predicting my latitude of birth.
I could be a member of many different SSA-classes and for each of them make independent predictions about my position in them.
For SIA the class of “subjectively indistinguishable” my copies could be also not very exact. Different interpretation of such class is:
1) everybody is me who have the same thought process as me now. There could be a lot of them, even on Earth.
2) everybody, who has the total sum of all visual (and other) experiences as me, even despite the fact that I will not be able to account for all differences as they are too small to account.
3) everybody who has exactly the same brain as me. This class hundred orders of magnitude more rare than (2), as the same experience could be generated by different brains.
I think that “true” SIA class is somewhere between (1) and (2) - or more likely, there is no “true SIA class”, the same way as there is no true SSA-class, and different types of SIA could be used to answer different questions.
Yep. ^_^