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NNTP-Posting-Date: Thu, 05 Sep 2024 19:57:34 +0000
Subject: Re: Replacement of Cardinality (infinite middle)
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From: Ross Finlayson <ross.a.finlayson@gmail.com>
Date: Thu, 5 Sep 2024 12:57:26 -0700
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On 09/03/2024 01:50 PM, Jim Burns wrote:
> On 9/2/2024 8:25 PM, Ross Finlayson wrote:
>> On 09/02/2024 02:46 PM, Jim Burns wrote:
>>> On 9/1/2024 2:44 PM, Ross Finlayson wrote:
>
>>>> Then the point that induction lets out is
>>>> at the Sorites or heap,
>>>> for that Burns' "not.first.false", means
>>>> "never failing induction first thus
>>>> being disqualified arbitrarily forever",
>>>
>>> Not.first.false is about formulas which
>>> are not necessarily about induction.
>>>
>>> A first.false formula is false _and_
>>> all (of these totally ordered formulas)
>>> preceding formulas are true.
>>>
>>> A not.first.false formula is not.that.
>>>
>>> not.first.false Fₖ  ⇔
>>> ¬(¬Fₖ ∧ ∀j<k:Fⱼ)  ⇔
>>> Fₖ ∨ ∃j<k:¬Fⱼ  ⇔
>>> ∀j<k:Fⱼ ⇒ Fₖ
>>>
>>> A finite formula.sequence S = {Fᵢ:i∈⟨1…n⟩} has
>>> a possibly.empty sub.sequence {Fᵢ:i∈⟨1…n⟩∧¬Fᵢ}
>>> of false formulas.
>>>
>>> If {Fᵢ:i∈⟨1…n⟩∧¬Fᵢ} is not empty,
>>> it holds a first false formula,
>>> because {Fᵢ:i∈⟨1…n⟩} is finite.
>>>
>>> If each Fₖ ∈ {Fᵢ:i∈⟨1…n⟩} is not.first.false,
>>> {Fᵢ:i∈⟨1…n⟩∧¬Fᵢ} does not hold a first.false, and
>>> {Fᵢ:i∈⟨1…n⟩∧¬Fᵢ} is empty, and
>>> each formula in {Fᵢ:i∈⟨1…n⟩} is true.
>>>
>>> And that is why I go on about not.first.false.
>
>> Then about not.first.false
>> thanks for writing that up a bit more,
>> then that also you can see what I make of it.
>
> What I find poetic about not.first.false and all that
> is that our finiteness isn't only _permitted_
> It is _incorporated into_ our logic. _Required_
>
> A finite linear order _must be_ well.ordered
> (must be, both ways)
> ∀γ:T(γ) ⇐ ∀β:(T(β) ⇐ ∀α<β:T(α))
> ∀α:T(α) ⇐ ∀β:(T(β) ⇐ ∀γ>β:T(γ))
>
> We are finite.
> The formulas we write are finitely.many.
> In a linear order, they must be in a well.order.
>
> In a well.order,
> if each formula Φ[β] is not.first.false
> ∀β:¬(¬T(Φ[β] ∧ ∀α<β:T(Φ[α])
> ∀β:(T(Φ[β]) ⇐ ∀α<β:T(Φ[α]))
> then each formula is not.false.
> ∀γ:T(Φ[γ])
>
> ...because well.order (because finite).
> ∀γ:T(Φ[γ]) ⇐ ∀β:(T(Φ[β]) ⇐ ∀α<β:T(Φ[α]))
>
>> Not.ultimately.untrue, ..., has that
>> F, bears the value for all F_alpha parameterized by ordinals
>> (which suffice, large enough, to totally order things),
>> of true, and that,
>> there are classes of formulas F,
>> for example self-referential or differential formulas,
>> defined for example according to
>> "when F_alpha is not also as for an ordinal less than omega",
>> at least making a trivial clear example of
>> a definition that is for classes of these sorts formulas
>> where "not.ultimately.untrue" is not held by all classes
>> for formulas "not.first.false".
>
> "Not.ultimately.untrue" sounds to me vaguely like "ω-consistent".
> But I don't really know what you are talking about.
> I usually don't know what you are talking about.
> It is what it is.
>
>

That "points do not make lines" and "lines do not make points"
yet "any two points define a line" and "any two intersecting lines
define a point", are of course quite fundamental and elementary
since for most of time that Euclid's Elements is the second-most
published book in the world.

(Euclid is a panel.)

https://en.wikipedia.org/wiki/Transfer_principle

I have pretty much no use for the hyper-reals as merely
a "conservative" (i.e., saying nothing) extension of the
usual Archimedean field, while, something like Nelson's
Internal Set Theory and that it's co-consistent with ZFC,
with regards to either "both or neither", much like the
"both or neither" of "the anti-diagonal and the only-diagonal",
have that there are "conservative non-standard" extensions
saying _nothing_ and "non-conservative non-standard" extensions
saying _something_.

When Hilbert _added_ a postulate of continuity to Euclid's axioms,
so to establish that a point-set topology could be a thing at
all, it's quite a non-conservative non-standard axiom, as it were,
itself, though of course for "axiomless geometry" it already
exists from there being a prototype continuum as elementary
in a theory, co-consistent this theory of geometry "points
and spaces" with the usual theory of words (algebra's,
set theory's, ...), that, more-than-less you might as
well start reading the most-published book in the world,
or just the first few items "in the beginning ..." there
was space then from the middle "in the beginning ..." there
was the word, of an example of a necessary sort of ontological
commitment with regards to nominalism, and its weaker forms
fictionalism, fallibilism, and anti-realism.

I.e., as a strong mathematical platonist with a stronger
logicist positivism, my model philosopher's model physicist's
model philosophy's model physics, easily encompasses the
tiny, weaker, hereditarily-finite fragment what's conservative
off ZFC.

https://en.wikipedia.org/wiki/Eleatics

"The Eleatics have traditionally been seen as advocating a strict
metaphysical view of monism in response to the materialist monism
advocated by their predecessors, the Ionian school."




It certainly is what it is, ....