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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.

So there can be no elements in Ф.

In other words, it is an empty set.