/sci/ - Science & Math

>>14798646
Continuation of these posts
>>14800018
When everett says

"If not, we are forced to admit that systems which contain observers
are not subject to the same kind of quantum-mechanical description as we
admit for all other physical systems."

He is talking about the von neuman chain, which is the infinite regress of measurement devices, which brings about the situation where nothing ever happens in the world. There's nothing to change the isolated system of possible outcomes to the actual outcomes. It takes something outside of the physical world to do that. The detector should be made of quantum particles as with the recording device on up to the eyes to the brain etc. This should all just be governed by the unitary evolution. But that's not what we measure. This happens
>The probabilistic, non-unitary, non-local, discontinuous change brought about by observation and measurement

A short definition of the von neuman chain
>This problem - known as the von Neumann chain – is a regression of measuring devices, whose stopping point is presumed to be the conscious mind (i.e. not a purely physical measurement device, but a conscious entity who actually reads said measurement, effectively stopping the chain).

Here is a vid on the measurement problem
https://www.youtube.com/watch?v=qB7d5V71vUE