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On 24.10.2024 16:37, Moebius wrote:Sigh.
Hint: For any nonempty set of natural numbers M:Important! If all those numbers are doubled, then their density is halved, their number remains constant, and their interval is doubled.
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M is infinite iff for each and every element m in M there's an element m' in M such that m' > m.
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(Note that sets don't change.)
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