Let A be a denumerable set. Prove that(a) the set of all 1-element subsets of A isdenumerable.(b) the set of all 2-element subsets of A isdenumerable.(c) for every is denumerable.(d) the set of all finite subsets of A is denumerable.(Hint: Use Theorem 5.3.8.)

Now You Try It (NYTI): x − 2x − 3 1. Let f(x)= 2 . x − 1 (a) Evaluate each limit below. m i l ) i (i) limi− f(x) ( + f(x). x→−1 x→1 (b) Find and describe/classify each discontinuity...