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From: olcott <polcott333@gmail.com>
Newsgroups: sci.logic
Subject: Re: How a True(X) predicate can be defined for the set of analytic
 knowledge
Date: Tue, 25 Mar 2025 09:40:26 -0500
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In-Reply-To: <vrmomn$b31e$1@dont-email.me>

On 3/22/2025 11:32 AM, Mikko wrote:
> On 2025-03-21 12:43:39 +0000, olcott said:
> 
>> On 3/21/2025 3:41 AM, Mikko wrote:
>>> On 2025-03-20 14:57:16 +0000, olcott said:
>>>
>>>> On 3/20/2025 6:00 AM, Richard Damon wrote:
>>>>> On 3/19/25 10:42 PM, olcott wrote:
>>>>>> It is stipulated that analytic knowledge is limited to the
>>>>>> set of knowledge that can be expressed using language or
>>>>>> derived by applying truth preserving operations to elements
>>>>>> of this set.
>>>>>
>>>>> Which just means that you have stipulated yourself out of all 
>>>>> classical logic, since Truth is different than Knowledge. In a good 
>>>>> logic system, Knowledge will be a subset of Truth, but you have 
>>>>> defined that in your system, Truth is a subset of Knowledge, so you 
>>>>> have it backwards.
>>>>>
>>>>
>>>> True(X) always returns TRUE for every element in the set
>>>> of general knowledge that can be expressed using language.
>>>> It never gets confused by paradoxes.
>>>
>>> Not useful unless it returns TRUE for no X that contradicts anything
>>> that can be inferred from the set of general knowledge.
>>>
>>
>> I can't parse that.
>>  > (a) Not useful unless
>>  > (b) it returns TRUE for
>>  > (c) no X that contradicts anything
>>  > (d) that can be inferred from the set of general knowledge.
> 
> Can you parse "It might be useful if it would return something else that
> TRUE for some X, especially if that X contradicts something that can be
> inferred from the set of general knowledge." ?
> 

Before we can get into these details it must first be
acknowledged that True(X) would necessarily work correctly
for the set of actual knowledge that can be expressed in
language.

True(X) for this set proves Tarski was wrong that no True(X)
can ever be consistently defined. Silly self-contradictory
expressions are simply rejected as not members of the
body of knowledge.

-- 
Copyright 2025 Olcott "Talent hits a target no one else can hit; Genius
hits a target no one else can see." Arthur Schopenhauer