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RichardChappell comments on By Which It May Be Judged - Less Wrong
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I just wanted to agree with Tristanhaze here that this usage strikes me as non-standard. I want to put this in my own words so that Tristanhaze/Eliezer/others can correct me if I've got the wrong end of the stick.
If something is a rigid designator it means that it refers to the same thing in all possible worlds. To say it's non-rigid is to say it refers to different things in some possible worlds to others. This has nothing to do with whether different language users that use the phrase must always be referring to the same thing. So George Washington may be a rigid designator in that it refers to the same person in all possible worlds (bracketing issues of transworld identity) but that doesn't mean that in all possible worlds that person is called George Washington or that in all possible worlds people who use the name George Washington must be referring to this person or even that in the actual world all people who use the name George Washington must be referring to this person.
To say "water" is a rigid designator is to say that whatever possible world I am talking about, I am picking out the same thing when I use the word water (in a way that I wouldn't be when I say, "the tallest person in the world" - this would pick out different things in different worlds). But it doesn't say anything about whether I mean the same thing as other language users in this or other possible worlds.
ETA: So the relevance to the quoted section is that rigid designators aren't about whether someone that thinks of Euclidean geometry when you say "numbers" is right or wrong - it's about whether whatever they associate with that word is the same thing in all possible worlds (or whether it's a different thing in some worlds).
ETA 2: I take it that Eliezer's paragraph here is in response to comments like these. I'm in a bit of a rush and need to think about it some more but I think Richard may be making a different point here to the one Eliezer's making (on my reading). I think Richard is saying that what is "right" is rigidly determined by my current (idealised) desires - so in a possible world where I desired to murder, murder would still be wrong because "right" is a rigid designator (that is, right from the perspective of my language, a different language user - like the me that desires murder - might still use "right" to refer to something else according to which murder is right. See the point about George Washington being able to be rigid even if people in other possible worlds use that name to name someone else). On the other hand, my reading of Eliezer was that he was taking the claim that "right" (or "fair") is a rigid designator to mean something about the way different language users use the word "fair". Eliezer seemed to be suggesting that rigid designation implied that words intrinsically mean certain things and hence that rigid designation implies that if someone uses a word in a different way they are wrong (using numbers to refer to geometry). I could have misunderstood either of these two comments but if I haven't then it seems to me that Eliezer is using rigid designator in a non-standard way.
Correct. Eliezer has misunderstood rigid designation here.
So does that mean this:
...is your real claim here, independent of any points about language use?
If so, I think I would just straightforwardly modify my paragraph above to say that my statements are not trying to talk about language use or human brains / desires, albeit that desire is both an optimization target of, and a quotation of, morality.
I'm not sure what you have in mind here. We need to distinguish (i) the referent of a concept from (ii) its reference-fixing "sense" or functional role. The way I understood your view, the reference-fixing story for moral terms involves our (idealized) desires. But the referent is "rigid" in the sense that it's picking out the content of our desires: the thing that actually fills the functional role, rather than the role-property itself.
Since our desires typically aren't themselves about our desires, so it will turn out, on this story, that morality is not "about" desires. It's about "love, friendship," and all that jazz. But there's a story to be told about how our moral concepts came to pick out these particular worldly properties. And that's where desires come in (as I understand your view). Our moral concepts pick out these particular properties because they're the contents of our idealized desires. But that's not to say that therefore morality is "really" just about fulfilling any old desires. For that would be to neglect the part that rigid designation, and the distinction between reference and reference-fixing, plays in this story.
Does that capture your view? To further clarify: the point of appealing to "rigid designation" is just to explain how desires could play a reference-fixing role without being any part of the referent of moral talk (or what it is "about"). Isn't that what you're after? Or do you have some other reference-fixing story in mind?
This all does sound good to me; but, is there a way to say the above while tabooing "reference" and avoiding talk of things "referring" to other things? Reference isn't ontologically basic, so what does it reduce to?
Basically, the main part that would worry me is a phrase like, "there's a story to be told about how our moral concepts came to pick out these particular worldly properties" which sounds on its face like, "There's a story to be told about how successorship came to pick out the natural numbers" whereas what I'd want to say is, "Of course, there's a story to be told about how moral concepts came to have the power to move us" or "There's a story to be told about how our brains came to reflect numbers".