Hi Bruno Marchal
Perhaps I have gotten things wrong, but
Godel's problem seems to me to be the self-reference
problem uncovered by B Russell, namely
that a class (if I am using the right word) cannot
itself be a member of that class.
For example suppose we have a list of siblings, john, jacob and jeremy.
Then the list itself cannot be a sibling.
[Roger Clough], [rclo...@verizon.net]
"Forever is a long time, especially near the end." -Woody Allen
----- Receiving the following content -----
From: Bruno Marchal
Time: 2012-11-20, 12:31:38
Subject: Re: Evolutionary logic Re: Some musings on is/ought and modal logic
On 20 Nov 2012, at 16:02, Alberto G. Corona wrote:
2012/11/11 Bruno Marchal <marc...@ulb.ac.be>
On 11 Nov 2012, at 01:29, Alberto G. Corona wrote:
It is an observable fact. is obviously true that if you live in a society
where everyone take something as true , no matter what, then it is true for one
of its members, you, for example.
That's correct. But that still does not make it true. Sometimes everybody can
That? the reson why truth can only be defined in objective terms as a belief
(except perhaps in the realm of mathematics).
Well, mathematicians can differ a lot, but arithmetic seems to be the sharable
part of math.
When I say this is true, I? saying that I believe that this is true.
I don't think this is a good idea. This works well in many case, but on the
fundamental question it is better to distinguish truth and belief. truth, by
definition, cannot be made wrong, and is independent of our beliefs. Beliefs
are typically wrong most of the time. "P" and "I believe P" have a very
So truth in the realm of experience means "accepted as truth" in a certain
I would call that delusion. of course sometimes we can be lucky, and assert a
genuine truth. But this we can never be sure of, except perhaps in arithmetic
(but I do not use this in the reasoning I do).
We can?t go further than that if we want to stay objective (or tautological).
I think we can, as we can have faith in truth, and just admit that we don't
know it. We can still searching. defining truth by beliefs would lead to
Thay point of view would be pure relativism unless natural selection is
Or many things weaker than that a priori. If you agree that 43 is prime, that
is already a lot.
I cannot start with natural selection, as I am agnostic on nature. I don't know
what it is, if that exist, at which level, etc. It presuppose also arithmetic,
and with comp I can argue that I cannot add anymore, except for the
I do believe in natural selection, but not that it is something so fundamental.
first person consciousness selection is more important, as it selects also the
laws making natural selection possible.
The absolute requirement of existence of the minds which habites in the
environmment of the laws of reality makes certain truths possible and certain
But such a sentences assumes a lot.
For example, that "electrons collapse in the nucleus is" can never be true for
any living being.
Of course, this is a well known physical facts well explained by QM. But with
comp, it is nothing but a complex problem, we have to derive QM from + and *
neither "Mothers don? love their children" for the very same reason in humans.
Because these candidates for truth are incompatible with the existence of minds
(1) and the human mind (2).
Hmm.. I can agree, but you are quick. Many mothers does not like their
children. Some kill them. Some kill them all, as in a recent case nearby. It is
a known phenomenon.
In the middle, there are many truths that can be accepted as truths in some
contexts, no matter if they are later refuted. Our time is by no means any
different from other times in history. Almost all that we known can be proved
wrong in a way or other. except perhaps mathematics (and not even that, if we
don? consider life ( autopoietic computation) as criteria for existence).
To summarize, to say that all may be wrong is not an impediment for a objective
study of truth as as a evolutionary phenomenon and his closed identity with
what exist and is perceived good .
I agree. That is why I think it is better to distinguih Truth from beliefs, and
keep in mind that all scientific "truth" are only belief, by which it is meant
that they can be false. truth is what we search (when we have the taste for it).
I mean, that this historic consideration is the only objective non speculative
method of considering the notion of Truth, whatever if it is considered in
capital letters or not. I may say that truth is an evolutionary (historical)
path to Truth.
With comp something happen, which is that we can limit truth to arithmetical
truth. It remains a big non-computable thing, but it is rather conceptually
clear. Above arithmetics, with comp there are the mind tools and imagination,
and dreams, cohering or not? They can be justified from inside arithmetical
(1) What is objective is the study of beliefs (historical truths) and the
testing of hypothesis of why these beliefs (truths) exist. and others do not.
OK, but this leads to other belief. And history can be revised. It is bad but
it happens everyday, if you read many newspapers, you can see this.
(2)What is speculative, and has no firm ground, is to say "This is true"
without concern for the fact that this is the expression of a belief.
Yes, but that is a reason to distinguish the truth and the belief. Not a reason
to equate them.
the people in (2) are a subject of study for the people in (1).
OK, but such study can only be based on some belief, that is theory or
hypothesis. A belief is a questioning.
modal logic is something instrumental for (1)
pure logic is instrumental for (2)
people in (1) must explain the reductions from (1) to (2).
I gave here a way to do this last.
I explain how comp makes this already happening all the time in arithmetic.
I still did?t do that formally.
I did, but then it does not help so much apparently, as it asks for some amount
of works. But I am a mathematician, and I did not get more choice in the
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