Decoherence does not resolve the measurement problem in quantum mechanics. It results in a reduced density matrix that is an improper mixture, which cannot be treated as a proper mixture without additional postulates equivalent to wave function collapse. Observations with sufficient specificity are required to identify decoherence, but this does not imply that decoherence leads to a definitive collapse of the quantum state. The discussion references GianCarlo Ghirardi's thought experiment and highlights the distinction between proper and improper mixed states, emphasizing that no experiment can differentiate between them.
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Feeble Wonk said:I've got Susskind's book ordered. Looking forward to it. I'm almost afraid to ask, but how mathematically challenging is it. My skills in that arena are worse than pitiful.