Re: Re: Semantic vs logical truth

2012-12-03 Thread Roger Clough
Hi meekerdb 

1p is not a fiction. Your 1p is what is reading this page.


[Roger Clough], [rclo...@verizon.net]
12/3/2012 
"Forever is a long time, especially near the end." -Woody Allen

- Receiving the following content - 
From: meekerdb 
Receiver: everything-list 
Time: 2012-12-02, 18:04:38
Subject: Re: Semantic vs logical truth


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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Re: Re: Semantic vs logical truth

2012-12-03 Thread Roger Clough
Hi Richard Ruquist 

You still think everything's objective. But nobody know how to code 
1p because it's subjective.  3p is objective, 1p is subjective.


[Roger Clough], [rclo...@verizon.net]
12/3/2012 
"Forever is a long time, especially near the end." -Woody Allen

- Receiving the following content - 
From: Richard Ruquist 
Receiver: everything-list 
Time: 2012-12-02, 08:16:03
Subject: Re: Semantic vs logical truth


Roger,
Computers will do 1p truth when their results become emergent
in which case they will be doing the coding as well so to speak.
Richard

On Sun, Dec 2, 2012 at 7:11 AM, Roger Clough  wrote:
> Hi Bruno Marchal
>
> Semantic truth I think is 1p (personal, private) truth,
> which mnakes it contingent, while logical truth is necessary
> as well as public or 3p truth. I think
> comnputers have problems with 1p truth because
> for one thing the coding is done by someone outside.
>
>
> [Roger Clough], [rclo...@verizon.net]
> 12/2/2012
> "Forever is a long time, especially near the end." -Woody Allen
>
>
> - Receiving the following content -
> From: Bruno Marchal
> Receiver: everything-list
> Time: 2012-12-02, 04:07:39
> Subject: Re: Numbers in the Platonic Realm
>
>
> On 30 Nov 2012, at 21:28, meekerdb wrote:
>
> On 11/30/2012 10:02 AM, Roger Clough wrote:
>
> And a transcendent truth could be arithmetic truth or
> the truth of necessary logic.
>
>
> True in logic and formal mathematics is just marker "T" that is preserved by
> the rules of inference.
>
>
> This makes no sense. You confuse the propositional constant T, with the
> semantical notion of truth. The first is expressible/definable formally
> (indeed by T, or by "0 = 0" in arithmetic), the second is not (Tarski
> theorem). When we say that truth is preserved by the rules of inference, we
> are concerned with the second notion.
>
>
>
> In applications it is interpreted as if it were the correspondence meaning
> of 'true'.
>
>
> Like in arithmetic. Truth of "ExP(x)" means that it exists a n such that
> P(n), at the "metalevel", which is the bare level in logic (that explains
> many confusion).
>
>
>
>
> But like all applications of mathematics, it may be only approximate.
>
>
> Yes, but for arithmetic it is pretty clear, as we share our intuition on the
> so-called standard finite numbers.
>
> Bruno
>
>
> http://iridia.ulb.ac.be/~marchal/
>
>
>
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