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On 10/19/2024 4:16 AM, WM wrote:The washing of dishes is one of those thingsOn 18.10.2024 00:34, Jim Burns wrote:>On 10/1v7/2024 2:22 PM, WM wrote:On 17.10.2024 00:39, Jim Burns wrote:>>>The only set of natural numbers with no first>
is the empty set..
No, the set of dark numbers is
another set without smallest element.
A nonempty set without a first element
is not a set of only finite ordinals.
The set of dark numbers contains
only natural numbers.
There is a general rule not open to further discussion:
Things which aren't natural numbers
shouldn't be called natural numbers.
>What you call a "set of finite ordinals" is>
not a set
but a potentially infinite collection.
There is a general rule not open to further discussion:
Finite sets aren't potentially infinite collections.
>
----
Consider nonempty S of only finite ordinals:
only ordinals with only finitely.many priors.
>
k ∈ S is a finite ordinal
Its set ⦃j∈𝕆:j<k⦄ of priors is finite.
>
⦃j∈𝕆:j<k⦄∩S ⊆ ⦃j∈𝕆:j<k⦄
⦃j∈𝕆:j<k⦄∩S is a finite set
⦃j∈𝕆:j<k⦄∩S holds its first or is empty.
>
⎛ If Priors.in.S ⦃j∈𝕆:j<k⦄∩S is empty
⎝then k is first.in.S
>
⎛ If Priors.in.S ⦃j∈𝕆:j<k⦄∩S is not empty
⎜ then i is first.in.⦃j∈𝕆:j<k⦄∩S
⎜
⎜⎛ For i and m ∈ S, i≠m,
⎜⎜ consider set {i,m} of finite ordinals
⎜⎜ {i,m} holds first.in.{i,m}
⎜⎜ i<m ∨ m<i
⎜⎜
⎜⎜ i<m
⎜⎜⎛ Otherwise, m<i and
⎜⎜⎜ m ∈ ⦃j∈𝕆:j<k⦄∩S and
⎜⎝⎝ i isn't first.in.⦃j∈𝕆:j<k⦄∩S
⎜
⎜ for i and m ∈ S, i≤m
⎝ i is first.in.S
>
Nonempty S of only finite ordinals
holds first.in.S
>>>No, the set of dark numbers is>
another set without smallest element.
A nonempty set without a first element
is not a set of only finite ordinals.
The set of dark numbers contains
only natural numbers.
If dark numbers 𝔻 doesn't hold first.in.𝔻
then
either 𝔻 is empty
or 𝔻 isn't only finite ordinals.
>Proof:>
If you double all your finite ordinals
you obtain only finite ordinals again,
Yes.
>although the covered interval is>
twice as large as the original interval
covered by "all" your finite ordinals.
No.
The least.upper.bound of finites is ω
The least.upper.bound of doubled finites is ω
>
>
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