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On 2/10/25 4:56 AM, WM wrote:
Does Zermelo define a set by induction or only its elements?The set of useless FISONs is inductive and therefore infinite. No FISON can change the assumption U(A(n)) = ℕ. Therefore every FISON can be omitted. ==> { } = ℕ.Which means that each element is not needed, but doesn't prove that you can't get the answer from a union of an infinite set of them.
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