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On the set problem in discrete mathematics, the generalized union of empty sets, why is it an empty set, that is, ∩Ф = Ф, and why?
X∈∪A means there is an ∈A, X ∈ A.
So if there is x, x ∈ Ф means there is a ∈Ф, x ∈ a.
It is precisely because an empty set has no elements that the latter cannot be logically established.