<
khongdo...@gmail.com> wrote in message
news:6c17b4be-b011-4773...@googlegroups.com...
No problem, I'll take the holes to have markings 0, S0, SS0, SSS0 etc..
Hmm, since I get bored typing out e.g. SSSSSSSSS0 with 9 S operations, in
what follows I'll shorten this using notation <9> to mean the same thing!
OK, so we have pigeons labelled as <0>, <1>, <2>, <3>,... etc. as well
ok, I'm with you so far - it is how I envisioned it more or less.
> > >
> > > Given the characterization of the collection K as above, then
*obviously*
> > if one
> > > claims that out of the uncountably many bars of K, he/she has chosen
by
> > Choice one
> > > bar as his/her *the standard* bar denoted by "N_bar", then the
following
> > statement
> > > (*) is true of this "the standard" N_bar:
> > >
> > > (*) It's impossible to know, to verify, for any given hole h that is
of
> > even-length
> > > of the marking, there are two pigeons dwelling in the the
compartments
> > and the
> > > sum of their DNA-sequence lengths is equal to the length of the
> > marking of the
> > > hole h.
But here I am confused. The problem is your phrase "chosen by Choice", and
also it is not a good plan to call the "chosen" bar "the standard N_bar",
because that has connotations that it is analagous somehow to what
mathematicians refer to as "the standard (intended) PA-structure N", which
it is not. (More below on this!)
To avoid arguments about meanings of words, here is my own wording of
something I would agree with, which hopefully captures what you are trying
to say in another way:
If k represents a specific successor bar from K, then dependent on the
choice of k, it could be that the claim above regarding pigeon labels (DNA
rungs/ladders) is true, or that it is false. So with no further information
about k, you might say "it is Impossible to Know the truth of the claim!"
but I would think that wording would be uninteresting to a mathematician
because the source of the "Impossibility to Know" is just that k is
unspecified so it is not even a specific "claim".
It is no different from the following argument:
1. Let x be a Natural number
2. Then it's Impossible to Know whether x > 100, because there are examples
of (1) where x is chosen so that x > 100, and examples where it's chosen
such that not x > 100.
This doesn't seem very profound to me, but if this is all you mean by your
phrase Impossible to Know [for the Pigeon/DNA claim] then I might go along
with that (at least in the context of the Pigeon/DNA claim).
But all this is irelevent, because the scenario with pigeons and
successor-bars is not analagous to the claim about cGC! (more below)
> > >
> > > If you understand and see that (*) is true in this precise analogy (of
the
> > new New
> > > Pigeonhole principle) as above, you'd understand that undecide(N |=
cGC)
> > where:
> > >
> > > - N is the purported "the standard" language structure for the
language
> > oif
> > > arithmetic.
> > > - cGC <-> "There are infinitely many counter examples of Goldbach
> > Conjecture".
> > > - undecide(S) <=> "It's impossible to know, to verify, the meta
statement
> > S is true".
Well, I'm afraid even if I agreed with the Pigeon/DNA claim (as I discussed
above) I wouldn't agree with your claim about cGC. In fact, I'm not clear
exactly how you think they correspond! So you should spell this out a
bit... What follows is my guess at how you're thinking:
You are claiming a correspondance between K (the collection of the various
successor-bars) and various possible language structures of PA, right? So I
take it that a given successor-bar (with assigned pigeons) corresponds to
some specific language structure of PA? Ultimately I think you're aiming to
conclude that the different language structures / successor bars give
different answers to a cGC-like question, and "we don't know which language
structure / successor bar is the "intended" one, so we can't answer the
question....
And the holes in the successor bar going from left to right (in my diagram
above showing what a successor-bar looks like) represent successive
applications of the S (successor) function. Right? (Otherwise the name
"successor-bar" is very poorly chosen! :))
Now at this point I see you could intend one of two interpretations for your
description!
1) The universe (elements to be quantified over) for the PA language
structure corresponding to a specific successor-bar is the set of HOLES
themselves, which I think we've agreed are labelled left to right by the
language numerals <0>, <1>, <2>,.... So I'll refer to the n'th hole as
H(n) = hole_<n>.
2) The universe is the set of Pigeons, which I think we've agreed are also
labelled by the language numerals <0>, <1>, <2>,.... So I'll refer to the
n'th Pigeon as P(n) - fully understanding of course that the P(n) isn't
necessarily in hole H(n). (For some values of n, like all even n, this is
true, but for others not. Also it would not be true that S(P(n)) = P(n+1)
for all n.)
Which of (1) or (2) do you intend?
If you intend (1), then the pigeons are irrelevant to the interpretation of
cGC, because it only talks about holes H(n), never the pigeons P(n). So in
this case, all your uncountable successor bars (after ignoring the pigeons)
would be completely identical and you would have just ONE representation of
the standard (intended) model for PA, containing elements {H(0), H(1), H(2),
...} i.e. elements are H(n) for (standard) natural numbers n, and there is
even the natural correspondence for language terms where
<0> --> H(0)
<1> --> H(1)
<2> --> H(2)
etc.
So perhaps you intended (2), and so the universe for the language structure
is the set of pigeons {P(n): n in N}, N being the (standard) natural
numbers. Now we no longer have the neat natural correspondence we had for
(1) above, because <n> in the language structure does not necessarily
correspond to P(n). E.g. here is the correspondence for one particular
successor bar + pigeon assignment that I've just made up!
<0> --> P(0)
<1> --> P(1)
<2> --> P(2)
<3> --> P(5)
<4> --> P(4)
<5> --> P(3)
<6> --> P(6)
<7> --> P(7)
...
(Here we see pigeons labelled 3 and 5 are not in their corresponding holes -
just to prove I have followed what you're saying about which pigeons are
moved around! :)) Also here we see the successor of P(2) is P(5).
BUT HERE IS THE PROBLEM FOR YOU: Although you would have an uncountable
collection of different PA language structures (if my interpretation of what
you're meaning is correct), THEY ARE ALL ISOMORPHIC TO EACH OTHER, AND IN
PARTICULAR THEY ARE ALL ISOMORPHIC TO THE STANDARD (INTENDED) LANGUAGE
STRUCTURE OF PA.
In other words they are all isomorphic to the natural numbers N together
with the usual definition of zero, successor, addition, multiplication and
so on. More to the point: EXACTLY THE SAME LANGUAGE STATEMENTS ARE TRUE IN
THE LANGUAGE STRUCTURES CORRESPONDING TO EACH AND EVERY SUCCESSOR-BAR!
Coming back to cGC, which I take to be a statement in the language of PA, it
is either true in all the above language structures (corresponding to ALL of
the successor-bars), or false in ALL of them. Your claim that "obviously"
it is "Impossible to Know" the truth of your statement concerning
Successor-Bars, Pigeons and Holes was simply based on the rather mundane
observation that for some Successor-Bars the statement would be true, whilst
for other Successor-Bars it would be false. This has to be contrasted with
the corresponding PA-language structre/cGC statement, which is true in all
of the corresponding structures or false in all of them! So this argument
for "Impossible to Know" for cGC simply does not work.
What has gone wrong here? The answer is that your interpretation of cGC in
terms of successor-bars and pigeons is Wrong. When you talk about the
interpretation of a language statement in a language structure, what matters
is the interpretation of the statement using the interpretations of
functions, constants, predicates etc. AS DEFINED WITHIN THE LANGUAGE
STRUCTURE ITSELF. The labels applied to elements of the universal set
matter NOT ONE IOTA in this respect! In the case of PA, it's the
interpretation of the successor function and addition/multiplication
functions that give the individuals in the structure their meaning, not any
labels attached externally to the individuals.
Here I reproduce from above your claim about pigeons/holes:
> > > (*) It's impossible to know, to verify, for any given hole h that is
of
> > even-length
> > > of the marking, there are two pigeons dwelling in the the
compartments
> > and the
> > > sum of their DNA-sequence lengths is equal to the length of the
> > marking of the
> > > hole h.
You are trying to take this as corresponding to an arithmatic equivalent
statement:
It's impossible to know, to verify, for any given even number h,
that there are two prime numbers adding to h.
In this implied correspondence, you identify the even number h by its hole
markings, which correspond to the language numeral <h> (and so ultimately to
the number h in N), but then you ask about whether there are (prime) PIGEONS
with labels adding to h, BUT THESE LABELS DO NOT HAVE ANY INTERPRETATION AS
PA LANGUAGE ELEMENTS in the structure, so the whole comparison is completely
meaningless. (And so the correspondence and your conclusing fails.)
The CORRECT correspondance would be asking consistently about the language
numerals <n> and their interpretation in the language structures for each of
the successor-bars. Doing it this way (consistently) the corresponding
question for successor-bars should be purely referring to Hole numbers,
because as noted above
<n> = H(n) = Hole_<n> [i.e. the hole with n sticks, i.e. the n'th
hole! in the bar]
This is true of EVERY bar, regardless of any pigeon-assignment, so all such
arithmentic questions have the same answer for every bar. All this is just
an obvious consequence of the language structures for every bar all being
isomorphic, so OF COURSE such arithmetic questions come out with the same
answers in all bars, and the whole pigeon thing is an irrelevance! :)
Regards,
Mike.