Followup to: Mixed Reference: The Great Reductionist Project

Humans need fantasy to be human.

"Tooth fairies? Hogfathers? Little—"

Yes. As practice. You have to start out learning to believe the little lies.

"So we can believe the big ones?"

Yes. Justice. Mercy. Duty. That sort of thing.

"They're not the same at all!"

You think so? Then take the universe and grind it down to the finest powder and sieve it through the finest sieve and then show me one atom of justice, one molecule of mercy.

- Susan and Death, in Hogfather by Terry Pratchett

Suppose three people find a pie - that is, three people exactly simultaneously spot a pie which has been exogenously generated in unclaimed territory. Zaire wants the entire pie; Yancy thinks that 1/3 each is fair; and Xannon thinks that fair would be taking into equal account everyone's ideas about what is "fair".

I myself would say unhesitatingly that a third of the pie each, is fair. "Fairness", as an ethical concept, can get a lot more complicated in more elaborate contexts. But in this simple context, a lot of other things that "fairness" could depend on, like work inputs, have been eliminated or made constant. Assuming no relevant conditions other than those already stated, "fairness" simplifies to the mathematical procedure of splitting the pie into equal parts; and when this logical function is run over physical reality, it outputs "1/3 for Zaire, 1/3 for Yancy, 1/3 for Xannon".

Or to put it another way - just like we get "If Oswald hadn't shot Kennedy, nobody else would've" by running a logical function over a true causal model - similarly, we can get the hypothetical 'fair' situation, whether or not it actually happens, by running the physical starting scenario through a logical function that describes what a 'fair' outcome would look like:

So am I (as Zaire would claim) just assuming-by-authority that I get to have everything my way, since I'm not defining 'fairness' the way Zaire wants to define it?

No more than mathematicians are flatly ordering everyone to assume-without-proof that two different numbers can't have the same successor. For fairness to be what everyone thinks is "fair" would be entirely circular, structurally isomorphic to "Fzeem is what everyone thinks is fzeem"... or like trying to define the counting numbers a...

Highly Advanced Epistemology 101 for Beginners

Highly Advanced Epistemology 101 for Beginners