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as I understand, infinity may not be an upper limit, but it is equal to a Frank (which was an old way of one upmanship, where "I know the biggest number!" and then youd tell them a frank is bigger, where a frank is your number + 1)
so by such logic, infinity = frank(infinity)
On a number line, infinity can be placed. See the arrow at the end there? thats infinity, at least as far as I can tell, nothing gets much bigger than that arrow.
On the mathematical side of proofs, I have nothing, but its really just the concept that seems to matter.
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