Discrete Mathematics and Its Applications was written by and is associated to the ISBN: 9780073383095. This full solution covers the following key subjects: Countable, set, show. This expansive textbook survival guide covers 101 chapters, and 4221 solutions. This textbook survival guide was created for the textbook: Discrete Mathematics and Its Applications, edition: 7. The full step-by-step solution to problem: 28E from chapter: 2.5 was answered by , our top Math solution expert on 06/21/17, 07:45AM. Since the solution to 28E from 2.5 chapter was answered, more than 266 students have viewed the full step-by-step answer. The answer to “Show that the set Z+ × Z+ is countable.” is broken down into a number of easy to follow steps, and 9 words.