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Is there a very specific definition for all types of events where quantum decoherence occurs? Is it merely any event that is "thermodynamically irreversible" and/or "causes entropy to increase"? Is it mathematically defined?

Most importantly, is it possible to list some examples of events where quantum decoherence occurs?

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That is a good questions and if you find a definitive answer you should tell someone... –  dmckee Dec 29 '13 at 19:54
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