Well, if nothing else, when I ask B9 “is your ball blue?”, I’m only providing a finite amount of evidence thereby that “blue” refers to a property that balls can have or not have. So if B9′s priors on “blue” referring to anything at all are vastly low, then B9 will continue to believe, even after being asked the question, that “blue” doesn’t refer to anything. Which doesn’t seem like terribly sensible behavior. That sets a floor on how low the prior on “‘blue’ is meaningful” can be.
Well, if nothing else, when I ask B9 “is your ball blue?”, I’m only providing a finite amount of evidence thereby that “blue” refers to a property that balls can have or not have. So if B9′s priors on “blue” referring to anything at all are vastly low, then B9 will continue to believe, even after being asked the question, that “blue” doesn’t refer to anything. Which doesn’t seem like terribly sensible behavior. That sets a floor on how low the prior on “‘blue’ is meaningful” can be.