For MWI, merging as well as splitting is entailed by the unitary dynamics. From the friend's perspective he has, for all practical purposes, performed...
Many Worlds is fully compatible with Wigner's Friend. It's just a situation where worlds not only can split but also merge again under the right condi...
Yes, so why do McGee's examples seem to be counterexamples to modus ponens when they are not? Because the way the counterexamples are expressed sugges...
Here's another interesting example to test your solution on: I think the conclusion is true, and MP is valid here. For a further twist, consider repla...
I think we're interpreting the problem differently. You regard 1 as the background assumption, whereas I regard (1 v 2 v 3) as the background assumpti...
:up: By broader context, I meant a context where we consider only the characteristics of the die where face 1, 2 and 3 are all possibilities. So we mi...
Here's one (which reflects the election example). Suppose I have a 3-sided die with the following roll statistics: 1: 80% 2: 19% 3: 1% Before the die ...
As @"Banno" points out, that is not what they were doing. Among other things, they offered critiques of how language goes astray when not woven into o...
:up: Apropos my earlier post, I see that that book title comes from Heraclitus! :-) Indeed. Yes. On the other hand, QM can be considered as a generali...
Perhaps you could briefly present the problem that you're attempting to solve, and why the conventional (and scientific) language that most people fin...
Yep. A famous quote attributed to Bohr says: That is, what we can say about nature is that you will find, with some well-defined probability, either a...
I didn't see that quote in this thread, but I think the Wigner's Friend scenario that described suggests one solution to be that Wigner and his friend...
Thanks for your considered reply. I don't understand what the bolded phrase means nor why I should regard it as a fact. Conventionally, the term mind ...
Scientists claim that the Earth existed billions of years before the emergence of human beings (with minds). Either you are disagreeing with their cla...
There are important constraints on an epistemological view of QM. The main difference between a superposition and classical ignorance is that a superp...
I came across a nice proof of Godel's Incompleteness Theorem that utilizes computability and Cantor's diagonal argument (UC Davis lecture: Part 1 and ...
OK. But I just wanted to point out that there are other views, such as Aristotle's, where mathematics and logic aren't considered to be a priori or ex...
No, that's not Aristotle's position. See below. Augustine saw the divine mind as the ground for universals. Whereas for Aristotle, it's the concrete s...
As Wigner once suggested, there's a deep connection between mathematics and science. Per Aristotle, mathematics is the abstraction of the sensible - t...
There is no set of local hidden variables that can reproduce the predictions of quantum mechanics. So (subject to the assumptions of Bell's Theorem) t...
Yes, that would avoid Bell's Theorem since the two surfaces would be part of the same local object. The idea is similar to ER=EPR where the two entang...
Note that Einstein didn't mention entanglement when he used the famous "spooky" phrase below: Einstein's more general concern was the apparent non-loc...
Einstein is referring generally to an instantaneous measurement update (collapse) over a region of space which can involve just a single particle. As ...
Alice had half a mind to tell Bob what she really thought of him. Bob is in two minds about whether to go to the party. As well as being mindful, one ...
They wouldn't explain why. Bohr: "It is wrong to think that the task of physics is to find out how nature is." Heisenberg, "We have to remember that w...
If you look at Jim Baggott's categorization of wavefunction anti-realism versus realism at 26:40, he notes that psi does not collapse at all on an ant...
Thanks! BTW, it's worth noting that Bell's Theorem makes three assumptions - locality, counterfactual definiteness (i.e., hidden variables or classica...
OK, there's a challenge. I'll see if I can explain Bell's Theorem on an intuitive level. I'll use coins instead of particles. Suppose Alice and Bob ha...
No, that's the fallacy of division. It doesn't follow that something predicable of the whole should be predicable of any of the parts. In this case, o...
The pain is in your toe (unless it's referred pain). But no experience is taking place in your toe. It is you that is experiencing pain (or is in pain...
No, not in the brain. Where do I kick around a football with my kids? In the park, or my backyard. People (or bats) have experiences, not brains or mi...
As I'm using the term, experience is "practical contact with and observation of facts or events". Kicking a football around with my kids is an experie...
Yes, so conceivably echolocation technology could be embedded into the brain and body so that a person could see (so to speak) with their eyes closed....
No. The argument assumes there are objective and subjective worlds, which a non-dualist rejects. Here's a similar argument that doesn't assume dualism...
OK, but the basic point of Schrodinger's thought experiment was that if it doesn't make sense to imagine macroscopic phenomena being indeterminate, th...
I'm sure he did. But the thought experiment is not about what the cat observes, it's about where the line is drawn (if at all) for when a system stops...
I'm pretty sure Schrödinger and Wigner had carefully thought their ideas through. What is relevant are the implications of those thought experiments f...
Here's a possible way to think about it. Consider a superimposed photo. The number of times that the photo is superimposed doesn't change the amount o...
Those photons as well. Amplitude for every possible path through the apparatus contribute to the observed interference pattern - including when the ph...
OK, we're on the same page then. You seemed to be saying you could think about QM without that. Without detectors at the slits, the photon still inter...
Because that reflects the contribution of each branch to the wave function. You're mistaken. From Paul Dirac's classic textbook: Also you haven't said...
Just to reiterate @"fishfry"'s point with a simple example. In MWI, the total energy of the universe is the weighted average of the energies of each b...
That would be an instrumentalist view of science, but Wallace takes a realist view, i.e., that a theory represents the structure of the world. Newton ...
In the mathematical formulation of quantum mechanics there are usually six postulates, listed here. However it is possible to simplify the formulation...
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