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Sets, Functions, Relations - Northwestern University

2.1.6. Generalized Union and Intersection. Given a collec-tion of sets A1,A2,...,AN, their union is defined as the set of elements that belong to at least one of the sets (here n represents an integer in the range from 1 to N): [N n=1 An = A1 ∪A2 ∪···∪AN = {x | ∃n(x ∈ An)}. Analogously, their intersection is the set of elements ...

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  Into, Cellco, Collec tion

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