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dfranke comments on We are not living in a simulation - Less Wrong
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I don't get the question, frankly. Simulation, in my opinion, is not a single formula but the means of knowing the state of system at particular time. In this case, we need an "apparatus", even if it's only a piece of paper, crayon and our own brain. It will be a very simple simulator, yes.
Basically I'm asking: is gravity "real for all bodies inside the system" or "real for all bodies inside the simulator"?
If the former, then we have Tegmark IV.
If ONLY the latter, then you're saying that a system requires a means to be made known by someone outside the system, in order to have gravity "be real" for it. That's not substrate independence; we're no longer talking about its point of view, as it only becomes "real" when it informs our point of view, and not before.
Oh, I got what you mean by "Tegmark IV" here from your another answer. Then it's more complicated and depends on our definition of "existance" (there can be many, I presume).
I think gravity is "real" for any bodies that it affects. For the person running the simulator it's "real" too, but in some other sense — it's not affecting the person physically but it produces some information for him that wouldn't be there without the simulator (so we cannot say they're entirely causally disconnected). All this requires further thinking :)
Also, english is not my main language so there can be some misunderstanding on my part :)
Okay, I had pondered this question for some time and the preliminary conclusions are strange. Either "existance" is physically meaningless or it should be split to at least three terms with slightly different meanings. Or "existance" is purely subjective things and we can't meaningfully argue about "existance" of things that are causally disconnected from us.