Dear Richard,

AFAIK, Feynman never discussed this. It first shows up in Vaidman's work, I may be wrong:


----- Original Message ----- From: "rmiller" <[EMAIL PROTECTED]> To: "Stephen Paul King" <[EMAIL PROTECTED]>; <>
Sent: Wednesday, June 29, 2005 12:23 AM
Subject: Re: Witnesses, Observer Moments and Memories of a Past

At 10:31 PM 6/28/2005, Stephen Paul King wrote:
Dear Lee,

Are you familiar with any of the experiments that have been performed regarding "quantum counterfactuals" or "null measurements"? It turns out that the fact that some particular measure *was not made* counts just as much, and thus affects the results of a measurement, of an actual measurement that was made. Thus information of any occurrence or non-occurrence of a measure of a QM system, coded in an OM, will make a difference that can not be hand waved away.
    This is why I am introducing the notion of a witness.

RM: I assume this is not associated with Feynman's "all possible histories" approach?

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