This textbook survival guide was created for the textbook: Discrete Mathematics and Its Applications, edition: 7. This full solution covers the following key subjects: Countable, set, Positive, integers, Integer. This expansive textbook survival guide covers 101 chapters, and 4221 solutions. The answer to “Show that the set S is a countable set if there is a function f from S to the positive integers such that f?1(j) is countable whenever j is a positive integer.” is broken down into a number of easy to follow steps, and 32 words. The full step-by-step solution to problem: 33E from chapter: 2.SE was answered by , our top Math solution expert on 06/21/17, 07:45AM. Since the solution to 33E from 2.SE chapter was answered, more than 292 students have viewed the full step-by-step answer. Discrete Mathematics and Its Applications was written by and is associated to the ISBN: 9780073383095.