A topic within Quantum Mechanics, itself one of 12 topics in that field and part of Physics.
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Has working physicists state plainly that the measurement problem is unresolved, and that the theory's predictive success has not settled what it says the world is like.
link checked 17 Sept 2026Notes on this copyHugh Everett III
Argues that the wavefunction never collapses at all — every measurement outcome occurs, in a branch of the universal wavefunction relative to which the observer finds themselves.
24 pageslink checked 17 Sept 2026Notes on this copy