David Wallace
speaker
1,940 appearances
2 recordings
1 series
first heard May 2025
last heard 20 Jul
David Wallace’s voice in public audio — every appearance, attributed to the second.
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Appearances
rather different ways of approaching probability, more to do with sort of relative frequency ideas and trying to apply those ideas in Everett.
But these are relatively subtle distinctions and it's not as if
For the most part
I think Simon's take on these things is wrong or vice versa, it's more an emphasis issue.
No, it's an it's not a it's not a difference that's transparent at the level of the mathematics.
That's one of the reasons.
I don't think it's ultimately substantive.
So the weights on the branches just given by the Bourne rule, that's th th th I think that's a good that's if everyone agrees with that.
I mean if they're not you've got an embial problem.
Um but the um
The question is
What's the conceptual justification of interpreting the branch weights as probabilities?
And you can pull that in either direction.
I mean the the quasi dismissive
answer which I have at least some sympathy for is you can say, look, in the given the kind of assumptions about decoherence and emergent classicality that which are true dynamically of these systems, then the branch weights have the right formal properties to be probabilities.
What else in physics did we ever require of some piece of the mathematical structure?
um that it did more than have the right formal properties in order to be for us to stipulate that that's how we're interpreting it.
Um so you could say, look, the uh once you've established that the mathematical structure of quantum mechanics in the emergent regime is that of a stochastic quasi-classical theory, what more do you want?
Um and the other the other take in the other directions is m um more goes something like, Well, look, probability
by its very conceptual nature.
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