On 25 Feb 2014, at 07:31, Quentin Anciaux wrote:
Greaves rejects subjective uncertainty. With respect to spin up and
spin down pay special attention to the point in section 4.1 where,
in discussion of a thought experiment formally identical to Bruno's
step 3, he argues:
"What ... should Alice expect to see? Here I invoke the following
premise: whatever she knows she will see, she should expect (with
certainty!) to see. So, she should (with certainty) expect to see
spin-up, and she should (with certainty) expect to see spin-down."
That's nonsense, and contrary to observed fact.
Yes, it is the common confusion between 1 and 3 views. She should have
said:
"whatever she knows she will see, she should expect (with
certainty!) to see SOMETHING definite". And in the 1p it is obvious
she will never see both outcome".
Bruno
http://iridia.ulb.ac.be/~marchal/
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