Difference between revisions of "Union"
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Latest revision as of 12:15, 16 March 2016
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Definition
Given a collection of sets {Sα}α∈A their union is:
- ⋃α∈ASαwith the characteristic property that:
- x∈⋃α∈ASα⟺∃β∈A[x∈Sβ]
- x∈⋃α∈ASα⟺∃β∈A[x∈Sβ]
