# Re: The Nature of Truth

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On 31 Dec 2013, at 21:09, meekerdb wrote:```
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```On 12/31/2013 1:07 AM, Bruno Marchal wrote:
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```only rules to extract knowledge from assumed beliefs.
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I answered "no" to your question. Knowledge is not extracted in any way from belief (assumed or not). knowledge *is* belief, when or in the world those beliefs are true, but this you can never know as such.
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Since your theory to an infinite number of semi-classical worlds with different events (and even different physics) it seems that "true belief" is not a very useful concept.
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It is, because by incompleteness, we will have that Bp & p (true belief) obeys a different logic (an epistemic intuitionist logic) despite G* knows that it is the same machine, having the same action. The machine just dont know that, although it can infer it from comp + a sort of faith in herself.
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```Every belief is going to have probability zero of being true.
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neither Bp nor Bp & p is a priori related to probability. For this you need []p -> <>p, which is ocrrect for Bp & p, though, and indeed a physics appears already there, but that is a sort of anomaly (which confirms what I took as an anomaly in Plotinus, but the machine agrees with him). Now, Bp, when present in the nuances, gives the logic of the corresponding "certainty", so it is trivially a probability one. We need to extract the logic, and the probability different from 1 are handled by the mathematics, and is related to the Dp (not Bp). The probability bears on the accessible "worlds".
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The interesting concept is the probability of future events relative to one's current state.
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That's exactly why we need to go from Bp to Bp & Dt (or Bp & Dt & p, or actually Bp & p). This gives the relevant notion of relative consistency together with some temporal interpretation.
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Bruno

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Brent

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http://iridia.ulb.ac.be/~marchal/

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