Tim_Tyler comments on Probability is Subjectively Objective - Less Wrong

22 Post author: Eliezer_Yudkowsky 14 July 2008 09:16AM

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Comment author: Tim_Tyler 14 July 2008 06:08:01PM 7 points [-]

To answer Allan Crossman and "I never saw Jaynes spell out explicitly":

For some sixty years it has appeared to many physicists that probability plays a fundamentally different role in quantum theory than it does in statistical mechanics and analysis of measurement errors. It is a commonly heard statement that probabilities calculated within a pure state have a different character than the probabilities with which different pure states appear in a mixture, or density matrix. As Pauli put it, the former represents "Eine prinzipielle Unbestimmtheit, nicht nur Unbekanntheit". But this viewpoint leads to so many paradoxes and mysteries that we explore the consequences of the unified view, that all probability signifies only incomplete human information.

This is from Probability In Quantum Theory (1999). Jaynes seems to be ignoring animals and AIs.