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Name a FISON that can not be put into a set that is sufficient set, one whose union is the set of Natural Numbers.Every FISON. There is no sufficient set. If it is assumed, then F(1) can be omitted without changing the union of the remainder. And if F(n) can be omitted without changing this union, then also F(n+1) can be omitted without changing this union. That makes the omitted FISONs the inductive collection of all FISONs and proves the implication: If UF = ℕ, then { } = ℕ.
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