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Sudeep2 comments on Probability is in the Mind - Less Wrong

60 Post author: Eliezer_Yudkowsky 12 March 2008 04:08AM

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Comment author: Sudeep2 12 March 2008 04:41:26PM 1 point [-]

"Probabilities express uncertainty, and it is only agents who can be uncertain. A blank map does not correspond to a blank territory. Ignorance is in the mind."

Eliezer, in quantum mechanics, one does not say that one does not have knowledge of both position and momentum of a particle simultaneously. Rather, one says that one CANNOT have such knowledge. This contradicts your statement that ignorance is in the mind. If quantum mechanics is true, then ignorance/uncertainty is a part of nature and not just something that agents have.

Comment author: [deleted] 21 July 2013 03:11:13PM 2 points [-]

Wither knowledge. It is not knowledge that causes this effect, it is the fact that momentum amplitude and position amplitude relates to one another by a fourier transform.

A narrow spike in momentum is a wide blob in position and vice versa by mathematical necessity.

Quantum mechanics' apparent weirdness comes from wanting to measure quantum phenomena with classical terms.