Let r be the relation on the set of people with doctorates


Question: Let R be the relation on the set of people with doctorates such that(a, b) ∈ R if and only if a was the thesis advisor of b. When is an ordered pair (a, b) in R2? When is an ordered pair (a, b) in Rn, when n is a positive integer? (Assume that every person with a doctorate has a thesis advisor.)

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Mathematics: Let r be the relation on the set of people with doctorates
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