[extropy-chat] three coins in a fountain.
scerir at libero.it
Fri Oct 21 18:10:20 UTC 2005
From: "Julian Assange"
> I don't think probabilities exist 'in reality',
> but rather probabilities reflect our lack of knowledge
> and reality puts constraints on our ability
> to acquire knowledge.
A probability statement (in general) referes
to future events. Sometimes I like to think
that probability is the (necessarily subjective)
expectation value of some relative frequency, or,
in different words, that probability is
the predicted relative frequency.
If the above is true, there must be some 'process'
by which a (subjective) prediction (or a subjective
expectation value) becomes actual, becomes the
When this 'process' is seen as a property of
a physical system (better: a property of a quantum
system plus its context), it becomes a 'propensity'
(in Popper's terms), or a 'potentiality' (in Heisenberg).
Notice that when we write something like |cat dead>,
or |spin up>, very often we should not mean anything 'real',
anything 'ontic', since the measurement is still
to be performed, and since (in many cases, but not always)
our assumption that the result of the measurement
of a certain operator A depends on the state of the specific
quantum object we are measuring, and nothing else,
is flawed ('contextuality' problem).
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