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Originally posted by Tearman
What the heck? That's exactly the same thing I was saying. That the ****SUM**** of its parts make up the building... HEAVY emphasis on the word sum. That is, all of its parts (together as a building). You are saying that the building itself still exists, and you can somehow still walk into its front door and live or work inside of it as you could with a building that hasn't been demolished. I'm saying it only makes sense to call it a building if its parts are still in the form of a building. We could think of its demolished parts as formerly a building, but no longer capable of functioning as a building.
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Of course I read what I posted. The electron and positron are destroyed and in their place there is now gamma rays or other particles. I.E. THERE IS NO LONGER ANY ELECTRON. Its energy and momentum persist in the from of other particles, but no longer as an electron.
The counterargument to this is that lack of experience is not itself an experience. The critics argue that the continuity of consciousness, and the possibility of it enduring forever, are actually assumptions in this scenario, and ones with no physical basis.
Suppose a physicist standing beside a nuclear bomb detonates it. In almost all parallel universes, the nuclear explosion will vaporize the physicist. However, there is a small set of alternate universes in which the physicist somehow survives. The idea behind quantum immortality is that the physicist is only alive in, and thus able to experience, one of the universes in which a miraculous survival occurs, even though these universes form a small subset of the possible universes.
Unlike the Schrödinger's cat thought experiment which used poison gas and a radioactive decay trigger, this version involves a life-terminating device and a device that measures the spin value of photons. Every 10 seconds, the spin value of a fresh photon is measured. Conditioned upon that quantum bit, the weapon is either deployed, killing the experimenter, or it makes an audible "click" and the experimenter survives.
The theories are distinctive from the point of view of the experimenter only; their predictions are otherwise identical.
The probability of surviving the first iteration of the experiment is 50%, under both interpretations, as given by the squared norm of the wavefunction. At the start of the second iteration, if the Copenhagen interpretation is true, the wavefunction has already collapsed, so if the experimenter is already dead, there's a 0% chance of survival. However, if the many-worlds interpretation is true, a superposition of the live experimenter necessarily exists, regardless of how many iterations or how improbable the outcome. Barring life after death, it is not possible for the experimenter to experience having been killed, thus the only possible experience is one of having survived every iteration.