On 12/2/2012 7:27 AM, Bruno Marchal wrote:
The 1p truth of the machine is not coded in the machine. Some actual machines knows already that, and can justified that If there are machine (and from outside we can know this to correct) then the 1p-truth is not codable. The 1p truth are more related to the relation between belief and reality (not necessarily physical reality, except for observation and sensation).


Even the simple, and apparently formal Bp & p is NOT codable.
Most truth about machine, including some that they can know, are not codable.
Many things true about us is not codable either.

Let me see if I understand that. I think you are saying that p, i.e. that "p" describes a fact about the world, a meta-level above the coding of a machine. That the Mars Rover believes it is south of it's landing point is implicit in its state and might be inferred from its behavior, but there is no part of the state corresponding to "I *believe* I am south of my landing point." One could include such second-level states (which one might want to communicate to Pasadena) but then that state would be just another first-level state. Right?

Brent

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