Aristotle writes that if our brain is indivisible, it cannot conceptualize the infinitely divisible except through abstraction. "Infinity" is abstraction. That's why you're having this argument, and that's why it can't lead anywhere.
Sure it exists, but it would take an infinite amount of time to count to it, and infinite amount of space to store it. Do you see the problem yet? It defines itself.
Still don't believe me? Is the universe infinite? Does that mean there are infinite stars/planets? If so, there you have it.
If you answered no, then what happens when you get to the edge? Do you wrap around? Barring cataclysmic events, won't celestial bodies continue to orbit around the universe/galaxy/whatever-their-respective-centers-are indefinitely? Would you call this infinity?
Ultimately, the best proof is the mobius strip, or even simply an ant running on a treadmill. Since it is possible that the ant goes on forever and never reaches a dead end, we have infinity. I don't see how duckznutz can even dispute that.
On this note... It does not work every time; please don't taint the discussion with oversimplifications.
"i don't know" can figure out to "5". Infinity is surely greater than 5, isn't it?
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In the end we are but wisps
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