Discrete Mathematics with Applications 4th Edition

Published by Cengage Learning
ISBN 10: 0-49539-132-8
ISBN 13: 978-0-49539-132-6

Chapter 1 - Speaking Mathematically - Exercise Set 1.2: 9


a. Yes. b. No. c. No. d. Yes. e. Yes. f. No. g. Yes. h. No. i. Yes. j. Yes.

Work Step by Step

An element of a set is an object that appears in that set (i.e., within the two braces that define the set but not between any additional braces, unless the object is itself another set). A set is a subset of another set if every element in the first set also appears in the second set. Ignoring the braces that define each of the two sets, every element in the subset must appear exactly the same way that it appears in the superset.
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