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Am Tue, 22 Oct 2024 18:12:44 +0200 schrieb WM:On 22.10.2024 18:03, Jim Burns wrote:
∀n ∈ ℕ: 2×n ∈ ℕ
Not if all elements are existing before multiplication already.
*Especially* if all elements exist those are in there.Indeed! :-)
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