Discrete Math
posted by Sue .
(2) 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. Explain your answers.
(a) {(a, b)  a is taking a course from b}  This is not a function unless each student at the University of Calgary has just one professor, for if student a is taking courses from professor b1 and b2, the given set contains (a, b1) and (a, b2).
(b) {(a, c)  a’s first class each week is in c} – Yes, but explain why, please
(c) {(a, c)  a has a class in c on Friday afternoon}
I don't understand this at all, can someone put it in (a, c), (a, c) form.

A do not now