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On 22.12.2024 22:22, Jim Burns wrote:On 12/22/2024 6:32 AM, WM wrote:
A set is finiteᵂᴹ if it containsSet A is finiteⁿᵒᵗᐧᵂᴹ if A∪{x} is larger, for A∌x
a visibleᵂᴹ naturalᵂᴹ number of elements.
All naturalᵂᴹ numbers are finiteᵂᴹ but
the realm of darkᵂᴹ numbers
appears like infinityᵂᴹ.
Set Y is infiniteⁿᵒᵗᐧᵂᴹ if Y∪{x} isn't larger, for Y∌x
ℕⁿᵒᵗᐧᵂᴹ is the set of finiteⁿᵒᵗᐧᵂᴹ.cardinals.
which means
ℕⁿᵒᵗᐧᵂᴹ is the set of cardinals #A of
sets A smaller.than A∪{x} for A∌x
For each finiteⁿᵒᵗᐧᵂᴹ set A,
its cardinality #A is in ℕⁿᵒᵗᐧᵂᴹ
For each set Y without #Y in ℕⁿᵒᵗᐧᵂᴹ
Y is infiniteⁿᵒᵗᐧᵂᴹ, and
Y∪{x} isn't larger than Y, for Y∌x
ℕᵂᴹ is larger.than emptier.by.one sets,>The function E(n) decreases>
from infinity to zero
by single steps of height 1
like the function NUF(x) increases
by single steps of height 1.
Set theorists must accept
magic steps of infiniteᵂᴹ size or
refuse to describe these transitions at all.
Alternatively,
set theorists could continue to talk about
what set theorists talk about, instead of
what you (WM) talk about.
They do not wish to recognize that
their theory is self-contradictory. But perhaps students would be interested.
I tell them the following story.
>
The function Eᵂᴹ(n) decreases
from infinityᵂᴹ to zero
because in set theory ℕᵂᴹ \ {1, 2, 3, ...} = { }
is an accepted formula.
The set ℕᵂᴹ can get empty#ℕᵂᴹ > #(ℕᵂᴹ\{0})
by subtracting its elements.
Either this is possible one by one,For finiteⁿᵒᵗᐧᵂᴹ ℕᵂᴹ
then finite endsegments do exist,
or it is only possible be removingThe set ℕⁿᵒᵗᐧᵂᴹ of finiteⁿᵒᵗᐧᵂᴹ.cardinals holds
(after the first elements one by one)
the remaining elements collectively.
This shows the existence of
numbers which can be handled collectively only.
How should we call them?Infinite.finite.cardinals.
Another approach is to call [prove] the empty setThe empty limit set is caused by
the limit of the sequence E(n).
But note that a limit is a set [JB:]
⎡ in.which is each element in each set of
⎢ almost.all of infinitelyⁿᵒᵗᐧᵂᴹ.many sets
⎢ and
⎢ not.in.which is each element not.in each set of
⎣ almost.all of infinitelyⁿᵒᵗᐧᵂᴹ.many sets
between which [it] and all terms of the sequence
nothing fits.
Therefore the limit empty set causes
sets with few elements only.
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