On Saturday, July 28, 2018 at 12:44:54 PM UTC-5, Bruno Marchal wrote: > > > > The whole weirdness of QM is that we can measure effects which in that > formalism entails the actuality of counterfactuals. >
Counterfactuals in QM do not have the same ontology as classical objects. Prior to a measurement or decoherent process that shifts a superposition or entanglement phase from a system to a reservoir of states we might say the superposition of a quantum wave is a case of prior existing counterfactuals in a ψ-ontic interpretation, such as MWI. In MWI the counterfactual continues to exist after the process as well. In the deBroglie-Bohm interpretation the counterfactual does not exist. There is in that idea on active channel for the motion of the ontic particle.In ψ-epistemic interpretations it is odd to talk about counterfactuals existing or for that matter anything factual prior to the measurement of decoherence. As I have indicated QM is most likely neither purely ψ-ontic or ψ-epistemic, so to talk about anything "existing" is a bit strange. LC > > Computationalism is more than OK with this, as it predicted that for > almost all universal machine (that is all except a finite number of > exception), the reality below its substitution level is an infinite sum of > universal machine, and above its substitution level it is a finite sum of > universal machine (to handle with). > Actually, physical decoherence saves mechanism, and QM, from solipsism. > > Grayson, you seem to dislike the many-worlds or many-dreams, but > eventually, with mechanism, all we need to assume is the many-numbers, or > the many-combinators (as I will illustrate). > > The physical reality is not a mathematical structure among others: it is > the border of the observable from a universal machine viewpoint. A very > peculiar structure implied by mechanism and a notion of correct > self-reference. > > Bruno > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
