The answers to exercise marked [BB] can be found in the Back of the Book.
Suppose A is the set of students currently registered at the University of Calgary, B is the set of professors at the University of Calgary, and C is the set of courses currently being offered at the University of Calgary. Under what conditions is each of the following a function?
(a) [BB] {(a, b) |a is taking a course from b}
(b) {(a, c) |a's first class each week is in c}
(c) {(a, c) |a has a class in c on Friday afternoon}
Explain your answers.
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