Unformatted text preview: ∼ is an equivalence relation. Question 4. Let R be the relation on R r { } deﬁned by a R b iff a b ∈ Q or ab ∈ Q . Determine whether R is an equivalence relation. ( Hint: You may make use of the fact that √ 2 / ∈ Q .) 1...
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 Spring '08
 ctw
 Math, Sets, Equivalence relation

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