At 4:00 AM 06/27/2015, John Collier wrote:
I also see no reason that Bateson’s difference that makes a difference needs to involve meaning at either end. [KM] Right. The phrase saying “a difference that makes a difference” must be a prototypical example of second-order logic in that the difference appearing both in the subject and predicate can accept quantification. Most statements framed in second-order logic are not decidable. In order to make them decidable or meaningful, some qualifier must definitely be needed. A popular example of such a qualifier is a subjective observer. However, the point is that the subjective observer is not limited to Alice or Bob in the QBist parlance. Koichiro
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