I said arbitrary and uncountable, and if it's uncountable then it's infinite (unless you take "uncountable" to mean "too impractical to count", but I didn't mean that). |
I think I see what you mean, now.
What I think you mean by "uncountable" is that the quantity is so large that no matter how many more "+1" you add to "1+1+...+1", you'll never reach a value higher than the quantity. Am I right? This by itself is the typical definition of an infinite quantity: a quantity so large that it's larger than any natural number. No need to get "arbitrarily large" involved.
But the way you were saying it just leads to confusion. "Uncountable" has the meaning I stated above. It's a property of sets, not of quantities.
The thread is about the hypothetical existence of an infinite number of parallel universes, right? That's what I was talking about. |
So the answer to my question is "yes"?
No, I did mean to say infinity, not infinite set. I don't see how dividing infinity by a natural number can produce anything but infinity. For example, what is half of infinity? |
Okay, let's take a step back, because this is getting confusing.
Going back to that other post, you said
The problem with this is saying "subset of infinity infinite universes"... surely infinity divided by any other number is still infinity. Otherwise you'd be able to produce infinity by multiplying natural numbers. And this is all assuming "infinity" is even a number, which it probably isn't. |
The underlined sentence is the problem. In the sentence "subset of infinitely many universes", there's nothing to imply that the subset is to have any particular size.
For example, let's take
N={1,2,3,...}. Suppose we define a division operation of a set s that returns m sets of equal size. So
N/2 = {{2,4,6,...},{1,3,5,...}}. In this case, you're right. The size of
N is infinite, and the size of both the sets returned by
N/2 is also infinite. But {5} is no less a subset of
N than {2,4,5,...}. In fact, you said it yourself:
It is also possible that, assuming there are infinite universes and only a subset of them (possibly even only one) has a species capable of travelling to different universes |
So, again, what the problem?