Discrete Mathematics with Graph Theory
Discrete Mathematics with Graph Theory
3rd Edition
ISBN: 9780131679955
Author: Edgar G. Goodaire
Publisher: Prentice Hall
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Chapter 2.4, Problem 5E

(a)

To determine

To prove: ~ defines an equivalence relation when for a,b∈R\{0}, define a~b if and only if ab∈Q .

(b)

To determine

The equivalence class of 1.

(c)

To determine

To prove: 3¯=12¯

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Chapter 2 Solutions

Discrete Mathematics with Graph Theory

Ch. 2.1 - 5{x+2y|x{0,1,2},y{2,0,2}}Ch. 2.1 - 5{x+2y|x{0,1,2},y{2,0,2}}Ch. 2.1 - If A={a,b}, then bA.Ch. 2.1 - Prob. 4TFQCh. 2.1 - {,{}}Ch. 2.1 - {,{}}Ch. 2.1 - True/False Questions 7. Ch. 2.1 - Prob. 8TFQCh. 2.1 - (Assume A and B are sets). ABBA.Ch. 2.1 - If A has two elements, then P(P(A)) has eight...
Ch. 2.1 - Prob. 1ECh. 2.1 - 2. List five elements in each of the following...Ch. 2.1 - Let A={1,2,3,4}. List all the subsets B of A such...Ch. 2.1 - 4. Let . Are the following statements true or...Ch. 2.1 - 5. Determine which of the following are true and...Ch. 2.1 - Prob. 6ECh. 2.1 - Determine which of the following are true and...Ch. 2.1 - Prob. 8ECh. 2.1 - a) List all the subset of set {a,b,c,d} that...Ch. 2.1 - (a) How many elements are in the power set of the...Ch. 2.1 - Prob. 11ECh. 2.1 - Prob. 12ECh. 2.1 - Prob. 13ECh. 2.1 - Prob. 14ECh. 2.2 - Prob. 1TFQCh. 2.2 - Prob. 2TFQCh. 2.2 - Prob. 3TFQCh. 2.2 - Prob. 4TFQCh. 2.2 - If A and B are setsand AB, then AB.Ch. 2.2 - Prob. 6TFQCh. 2.2 - The name of Augustus De Morgan appears in both...Ch. 2.2 - (AC)(BcAc).Ch. 2.2 - True/False Questions 9. Ch. 2.2 - Prob. 10TFQCh. 2.2 - List A={xN|x7},B={xZ||x2|4} and C={xR|x34x=0}:...Ch. 2.2 - Prob. 2ECh. 2.2 - Prob. 3ECh. 2.2 - Prob. 4ECh. 2.2 - For A={a,b,c,{a,b}}, find (a) A{a,b} (b) {}P(A)...Ch. 2.2 - Prob. 6ECh. 2.2 - 7. Let , and . List the elements in the...Ch. 2.2 - Let n3 and A={1,2,3,.....n}. (a) How many subsets...Ch. 2.2 - Prob. 9ECh. 2.2 - 10. The universal set for this problem is the set...Ch. 2.2 - Prob. 11ECh. 2.2 - 12. Let P denote the set of primes and E the set...Ch. 2.2 - For nZ, let An={aZ|an}. Find each of the following...Ch. 2.2 - Prob. 14ECh. 2.2 - 15. Let , and . (a) Draw a Venn diagram showing...Ch. 2.2 - Prob. 16ECh. 2.2 - Prob. 17ECh. 2.2 - Prob. 18ECh. 2.2 - Prob. 19ECh. 2.2 - Prob. 20ECh. 2.2 - Prob. 21ECh. 2.2 - Prob. 22ECh. 2.2 - Prob. 23ECh. 2.2 - Prob. 24ECh. 2.2 - Prob. 25ECh. 2.2 - Prob. 26ECh. 2.2 - Prob. 27ECh. 2.2 - Prob. 28ECh. 2.2 - Prob. 29ECh. 2.2 - Prob. 30ECh. 2.2 - Prob. 31ECh. 2.3 - {(x,x+1)|xN} is a binary relation on N, the set of...Ch. 2.3 - True/False Questions 2. is a binary relation on...Ch. 2.3 - Let be a binary relation on a set A and let aA....Ch. 2.3 - Let R be a binary relation on a set A and let aA....Ch. 2.3 - Let R be a binary relation on a set A. If R is not...Ch. 2.3 - True/False Questions 6. Let be a binary relation...Ch. 2.3 - True/False Questions 7. Let be a binary relation...Ch. 2.3 - If a binary relation R is antisymmetric, then R is...Ch. 2.3 - If a binary relation R is notsymmetric, then it is...Ch. 2.3 - True/False Questions 10. Let be a binary relation...Ch. 2.3 - Let B denote the set of books in a college library...Ch. 2.3 - 2. Let A denote the set of names of streets in St....Ch. 2.3 - Determine which of the properties reflexive,...Ch. 2.3 - 4. With a table like that in Fig. 2.2, illustrate...Ch. 2.3 - 5. Let . List the ordered pairs in a relation on A...Ch. 2.3 - 6. Is it possible for a binary relation to be both...Ch. 2.3 - What is wrong with the following argument, which...Ch. 2.3 - Determine whether each of the binary relations R...Ch. 2.3 - Determine whether each of the binary relations R...Ch. 2.3 - Prob. 10ECh. 2.3 - Prob. 11ECh. 2.3 - Prob. 12ECh. 2.3 - Prob. 13ECh. 2.4 - True/False Questions “” defines an equivalence...Ch. 2.4 - An equivalence relation on a set A is a binary...Ch. 2.4 - Prob. 3TFQCh. 2.4 - Prob. 4TFQCh. 2.4 - Prob. 5TFQCh. 2.4 - Prob. 6TFQCh. 2.4 - Prob. 7TFQCh. 2.4 - Prob. 8TFQCh. 2.4 - Prob. 9TFQCh. 2.4 - Prob. 10TFQCh. 2.4 - Prob. 11TFQCh. 2.4 - Prob. 1ECh. 2.4 - 2. Explain why each of the following binary...Ch. 2.4 - Prob. 3ECh. 2.4 - Prob. 4ECh. 2.4 - Prob. 5ECh. 2.4 - For natural numbers a and b, define a~b if and...Ch. 2.4 - Prob. 7ECh. 2.4 - 8. For integers a, b, define if and only if for...Ch. 2.4 - 9. Define ~ on Z by if and only if is a multiple...Ch. 2.4 - 10. For integers a and b, define if for some...Ch. 2.4 - 11. For , define if and only if . (a) Prove that...Ch. 2.4 - For a,bZ, define a~b if and only if a2b2 is...Ch. 2.4 - Prob. 13ECh. 2.4 - Prob. 14ECh. 2.4 - Prob. 15ECh. 2.4 - Define ~ on R2 by (x,y)~(u,v) if and only if...Ch. 2.4 - Prob. 17ECh. 2.4 - Determine which of the following define...Ch. 2.4 - Prob. 19ECh. 2.4 - Prob. 20ECh. 2.4 - Prob. 21ECh. 2.4 - 22. Let A be the set of all natural numbers and ~...Ch. 2.4 - Prob. 23ECh. 2.4 - Prob. 24ECh. 2.4 - Prob. 25ECh. 2.5 - A partial order on a set A is a reflexive,...Ch. 2.5 - Prob. 2TFQCh. 2.5 - True/False Questions 3. The binary relation “” on...Ch. 2.5 - Prob. 4TFQCh. 2.5 - Hasse diagrams are used to identify the...Ch. 2.5 - Prob. 6TFQCh. 2.5 - Prob. 7TFQCh. 2.5 - Prob. 8TFQCh. 2.5 - Prob. 9TFQCh. 2.5 - The statement in Question 9 is the contrapositive...Ch. 2.5 - 1. Determine whether each of the following...Ch. 2.5 - 2. (a) List the elements of the set in...Ch. 2.5 - List all pairs (x,y) with xy in the partial orders...Ch. 2.5 - Prob. 4ECh. 2.5 - Prob. 5ECh. 2.5 - Prob. 6ECh. 2.5 - In the poset (P(S),) of subsets of a set S, under...Ch. 2.5 - Prob. 8ECh. 2.5 - Prob. 9ECh. 2.5 - 10. (a) Let and, for and in A, define if and...Ch. 2.5 - Prob. 11ECh. 2.5 - Prob. 12ECh. 2.5 - Prob. 13ECh. 2.5 - Prob. 14ECh. 2.5 - Prob. 15ECh. 2.5 - Prob. 16ECh. 2.5 - Prob. 17ECh. 2.5 - Prob. 18ECh. 2 - If A={xN|x7},B={xZ||x5|3}andC={2,3}, find (AB)C.Ch. 2 - Let A={xZ|1x2},B={2x3|xA},andC={xR|x=ab,aA,bB}....Ch. 2 - Prob. 3RECh. 2 - Prob. 4RECh. 2 - 5. This exercise refers to the Venn diagram shown...Ch. 2 - Prob. 6RECh. 2 - Let A={1}. Find P(P(A)).Ch. 2 - Prob. 8RECh. 2 - Give an example showing that the statement...Ch. 2 - Prob. 10RECh. 2 - 11. Let A be a set. (a) What is meant by the term...Ch. 2 - Let A={xR||x|1} and, for a,bA, define (a,b)R if...Ch. 2 - Determine whether ~ is reflexive, symmetric,...Ch. 2 - For a,bN, define a~b if and only if ab. Determine...Ch. 2 - 15. Define a relation R on Z by if is a multiple...Ch. 2 - 16. Define a relation R on Z by if is a multiple...Ch. 2 - 17. Let ~ denote an equivalence relation on a set...Ch. 2 - 18. Let ~ denote an equivalence relation on a set...Ch. 2 - Prob. 19RECh. 2 - Let A be the set of points different from the...Ch. 2 - Show that (P(Z),) is a partially ordered set.Ch. 2 - Let A={1,2,4,6,8} and, for a,bA, define a_b if and...Ch. 2 - 23. Let be a poset and . Can a and b have two...
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