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The Philosophy of Quantum Thermodynamics
If I know something about a system is the fact that I have knowledge about it part of that system, do I decrease the entropy of a system by studying it or is that a totally hair-brained notion? The short answer is no. There's no real reason to prefer a pure state over an impure one for one's Mad Dog Everrettianism. It really does matter for physics and what we do for things.