Discrete Mathematics with Graph Theory
3rd Edition
ISBN: 9780131679955
Author: Edgar G. Goodaire
Publisher: Prentice Hall
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 0.2, Problem 30E
Suppose that a is a rational number and that b is an irrational number. Prove that a+b is irrational.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Let n = 7, let p = 23 and let S be the set of least positive residues mod p of the first (p-1)/2
multiple of n, i.e.
n mod p, 2n mod p, ...,
2
p-1
-n mod p.
Let T be the subset of S consisting of those residues which exceed p/2.
Find the set T, and hence compute the Legendre symbol (7|23).
The first 11 multiples of 7 reduced mod 23 are
7, 14, 21, 5, 12, 19, 3, 10, 17, 1, 8.
23
The set T is the subset of these residues exceeding
2°
So T = {12, 14, 17, 19, 21}.
By Gauss' lemma (Apostol Theorem 9.6),
(7|23) = (−1)|T| = (−1)5 = −1.
how come?
Shading a Venn diagram with 3 sets: Unions, intersections, and...
The Venn diagram shows sets A, B, C, and the universal set U.
Shade (CUA)' n B on the Venn diagram.
U
Explanation
Check
A-
B
Q Search
田
3. A different 7-Eleven has a bank of slurpee fountain heads. Their available flavors are as follows: Mountain
Dew, Mountain Dew Code Red, Grape, Pepsi and Mountain Dew Livewire. You fill five different cups full
with each type of flavor. How many different ways can you arrange the cups in a line if exactly two Mountain
Dew flavors are next to each other?
3.2.1
Chapter 0 Solutions
Discrete Mathematics with Graph Theory
Ch. 0.1 - pandq is false if pandq are false.Ch. 0.1 - If pandq is false, then both pandq are false.Ch. 0.1 - True/False Questions
3. It is possible for both “”...Ch. 0.1 - True/False Questions
4. It is possible for both “”...Ch. 0.1 - The implication If 22=5, then 32=9 is true.Ch. 0.1 - The negation of a=b=0 is ab0.Ch. 0.1 - The converse of the implication in Question 5 is...Ch. 0.1 - True/False Questions
8. The double implication “...Ch. 0.1 - It is possible for both an implication and its...Ch. 0.1 - The statement Some frogs have red toes makes use...
Ch. 0.1 - The negation of an existential quantifier is its...Ch. 0.1 -
Classify each of the following statements as...Ch. 0.1 -
Classify each of the following statements as...Ch. 0.1 - 3. Rewrite each of the following statements so...Ch. 0.1 -
4. Determine whether each of the following...Ch. 0.1 - Write down the negation of each of the following...Ch. 0.1 -
6. Write down the converse and contrapositive of...Ch. 0.1 - Rewrite each of the following statements using the...Ch. 0.1 - Is it possible for both an implication and its...Ch. 0.1 - On page 4 of the text, we stated as more or less...Ch. 0.2 - If you want to prove a statement is true, it is...Ch. 0.2 - True/False Questions
2. If you want to prove a...Ch. 0.2 - The sentence A is a sufficient condition for Bis...Ch. 0.2 - True/False Questions
4. If A B, BC, CD, and CA...Ch. 0.2 - True/False Questions
5. If A B, BC, CD, and CA...Ch. 0.2 - The contrapositive of A Bis B A.Ch. 0.2 - A Bis true if and only if its contrapositive is...Ch. 0.2 - True/False Questions
8. is a rational number.
Ch. 0.2 - True/False Questions
9. 3.141 is a rational...Ch. 0.2 - True/False Questions
10. If and are irrational...Ch. 0.2 - True/False Questions
11. The statement “Every...Ch. 0.2 - The statement There exists an irrational number...Ch. 0.2 - What is the hypothesis and what is the conclusion...Ch. 0.2 - 2. In each part of Exercise 1, what condition is...Ch. 0.2 - Exhibit a counterexample to each of the following...Ch. 0.2 - Consider the following two statements: A: The...Ch. 0.2 - Determine whether the following implication is...Ch. 0.2 - State the converse of the implication in Exercise...Ch. 0.2 - 7. Answer Exercise 5 with replaced by .
Ch. 0.2 - Consider the statement A: If n is an integer, nn+1...Ch. 0.2 - 9. Let be an integer greater than 1 and consider...Ch. 0.2 - 10. A theorem in calculus states that every...Ch. 0.2 - 11. Let be an integer, . A certain mathematical...Ch. 0.2 - Consider the assertions A: For every real number...Ch. 0.2 - Answer Exercise 12 with A and B as follows. A:...Ch. 0.2 - 14. Answer true or false and supply a direct proof...Ch. 0.2 - Prove that n an even integer n2+3n is an even...Ch. 0.2 - 16. (a) Let be an integer. Show that either or...Ch. 0.2 - 17. Provide a direct proof that is odd for all...Ch. 0.2 - Prove that 2x24x+30 for any real number x.Ch. 0.2 - 19. Let and be integers. By examining the four...Ch. 0.2 - Let n be an integer. Prove that n2 is even if and...Ch. 0.2 - Prob. 21ECh. 0.2 - Prove that if n is an odd integer then there is an...Ch. 0.2 - 23. Prove that if is an odd integer, there is an...Ch. 0.2 - 24. Prove that there exists no smallest positive...Ch. 0.2 - 25. Let be the product of positive integers and ....Ch. 0.2 - 26. (For students who have studied linear algebra)...Ch. 0.2 - 27. (a) Suppose and are integers such that . Prove...Ch. 0.2 - Suppose a and b are integers such that a+b+ab=0....Ch. 0.2 - Suppose a is an irrational number. Prove that 1a...Ch. 0.2 - 30. Suppose that is a rational number and that is...Ch. 0.2 - Prob. 31ECh. 0.2 - 32. Find a proof or exhibit a counterexample to...Ch. 0.2 - Prob. 33ECh. 0.2 - Prob. 34ECh. 0.2 - Prob. 35ECh. 0.2 - Prob. 36ECh. 0.2 - Prob. 37ECh. 0.2 - Prove that there exist irrational numbers a and b...Ch. 0 - State, with a reason, whether each of the...Ch. 0 - Prob. 2RECh. 0 - 3. Write down the converse, the contrapositive and...Ch. 0 - Prob. 4RECh. 0 - Prob. 5RECh. 0 - Prob. 6RECh. 0 - Prob. 7RECh. 0 - Prob. 8RECh. 0 - 9. Let be an integer. Prove that is odd if and...Ch. 0 - Give a direct proof of the fact that a25a+6 is...Ch. 0 - Prob. 11RECh. 0 - Prob. 12RECh. 0 - 13. Prove, by way of contradiction, that if is a...Ch. 0 - Prob. 14RECh. 0 - Prob. 15RECh. 0 - Prob. 16RECh. 0 - Prob. 17RECh. 0 - Prob. 18RECh. 0 - Each of the integers 31, 331, 3331, 33331, 333331,...
Additional Math Textbook Solutions
Find more solutions based on key concepts
Find all solutions of each equation in the interval .
Precalculus: A Unit Circle Approach (3rd Edition)
1. How much money is Joe earning when he’s 30?
Pathways To Math Literacy (looseleaf)
In Exercises 5-36, express all probabilities as fractions.
23. Combination Lock The typical combination lock us...
Elementary Statistics
In Exercises 9-20, use the data in the following table, which lists drive-thru order accuracy at popular fast f...
Elementary Statistics (13th Edition)
For Problems 23-28, write in simpler form, as in Example 4. logbFG
Finite Mathematics for Business, Economics, Life Sciences and Social Sciences
NOTE: Write your answers using interval notation when appropriate.
CHECKING ANALYTIC SKILLS Fill in each blank ...
Graphical Approach To College Algebra
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, subject and related others by exploring similar questions and additional content below.Similar questions
- Find all solutions of the polynomial congruence x²+4x+1 = 0 (mod 143). (The solutions of the congruence x² + 4x+1=0 (mod 11) are x = 3,4 (mod 11) and the solutions of the congruence x² +4x+1 = 0 (mod 13) are x = 2,7 (mod 13).)arrow_forwardhttps://www.hawkeslearning.com/Statistics/dbs2/datasets.htmlarrow_forwardDetermine whether each function is an injection and determine whether each is a surjection.The notation Z_(n) refers to the set {0,1,2,...,n-1}. For example, Z_(4)={0,1,2,3}. f: Z_(6) -> Z_(6) defined by f(x)=x^(2)+4(mod6). g: Z_(5) -> Z_(5) defined by g(x)=x^(2)-11(mod5). h: Z*Z -> Z defined by h(x,y)=x+2y. j: R-{3} -> R defined by j(x)=(4x)/(x-3).arrow_forward
- Determine whether each function is an injection and determine whether each is a surjection.arrow_forwardLet A = {a, b, c, d}, B = {a,b,c}, and C = {s, t, u,v}. Draw an arrow diagram of a function for each of the following descriptions. If no such function exists, briefly explain why. (a) A function f : AC whose range is the set C. (b) A function g: BC whose range is the set C. (c) A function g: BC that is injective. (d) A function j : A → C that is not bijective.arrow_forwardLet f:R->R be defined by f(x)=x^(3)+5.(a) Determine if f is injective. why?(b) Determine if f is surjective. why?(c) Based upon (a) and (b), is f bijective? why?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Elements Of Modern AlgebraAlgebraISBN:9781285463230Author:Gilbert, Linda, JimmiePublisher:Cengage Learning,
Holt Mcdougal Larson Pre-algebra: Student Edition...AlgebraISBN:9780547587776Author:HOLT MCDOUGALPublisher:HOLT MCDOUGAL
Algebra & Trigonometry with Analytic GeometryAlgebraISBN:9781133382119Author:SwokowskiPublisher:Cengage
Elementary Geometry For College Students, 7eGeometryISBN:9781337614085Author:Alexander, Daniel C.; Koeberlein, Geralyn M.Publisher:Cengage,
Algebra for College StudentsAlgebraISBN:9781285195780Author:Jerome E. Kaufmann, Karen L. SchwittersPublisher:Cengage Learning
Algebra: Structure And Method, Book 1AlgebraISBN:9780395977224Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. ColePublisher:McDougal Littell
Elements Of Modern Algebra
Algebra
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Cengage Learning,
Holt Mcdougal Larson Pre-algebra: Student Edition...
Algebra
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Algebra & Trigonometry with Analytic Geometry
Algebra
ISBN:9781133382119
Author:Swokowski
Publisher:Cengage
Elementary Geometry For College Students, 7e
Geometry
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Cengage,
Algebra for College Students
Algebra
ISBN:9781285195780
Author:Jerome E. Kaufmann, Karen L. Schwitters
Publisher:Cengage Learning
Algebra: Structure And Method, Book 1
Algebra
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:McDougal Littell
Propositional Logic, Propositional Variables & Compound Propositions; Author: Neso Academy;https://www.youtube.com/watch?v=Ib5njCwNMdk;License: Standard YouTube License, CC-BY
Propositional Logic - Discrete math; Author: Charles Edeki - Math Computer Science Programming;https://www.youtube.com/watch?v=rL_8y2v1Guw;License: Standard YouTube License, CC-BY
DM-12-Propositional Logic-Basics; Author: GATEBOOK VIDEO LECTURES;https://www.youtube.com/watch?v=pzUBrJLIESU;License: Standard Youtube License
Lecture 1 - Propositional Logic; Author: nptelhrd;https://www.youtube.com/watch?v=xlUFkMKSB3Y;License: Standard YouTube License, CC-BY
MFCS unit-1 || Part:1 || JNTU || Well formed formula || propositional calculus || truth tables; Author: Learn with Smily;https://www.youtube.com/watch?v=XV15Q4mCcHc;License: Standard YouTube License, CC-BY