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Math
Discrete Mathematics With Applications5th Edition

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Chapter 8.3, Problem 16ES
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Discrete Mathematics With Applicat...

5th Edition
EPP + 1 other
ISBN: 9781337694193

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Section
Problem 1TY
Problem 2TY
Problem 3TY
Problem 4TY
Problem 5TY
Problem 6TY
Problem 1ES
Problem 2ES
Problem 3ES
Problem 4ES
Problem 5ES
Problem 6ES
Problem 7ES
Problem 8ES
Problem 9ES
Problem 10ES
Problem 11ES
Problem 12ES
Problem 13ES
Problem 14ES
Problem 15ES
Problem 16ES
Problem 17ES
Problem 18ES
Problem 19ES
Problem 20ES
Problem 21ES
Problem 22ES
Problem 23ES
Problem 24ES
Problem 25ES
Problem 26ES
Problem 27ES
Problem 28ES
Problem 29ES
Problem 30ES
Problem 31ES
Problem 32ES
Problem 33ES
Problem 34ES
Problem 35ES
Problem 36ES
Problem 37ES
Problem 38ES
Problem 39ES
Problem 40ES
Problem 41ES
Problem 42ES
Problem 43ES
Problem 44ES
Problem 45ES
Problem 46ES
Problem 47ES
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Discrete Mathematics With Applicat...

5th Edition
EPP + 1 other
ISBN: 9781337694193
Textbook Problem
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Let R be the relation of congruence modulo 3. Which of the following equivalence classes are equal? [ 7 ] , [ − 4 ] , [ − 6 , ] [ 4 ] , [ 27 ] , [ 19 ]

Let R be the relation of congruence modulo 7. Which of the following equivalence are equal? [ 35 ] , [ − 7 ] , [ 12 ] , [ 0 ] , [ − 2 ] , [ 17 ]

To determine

(a)

The equal equivalence classes.

Explanation

Given information:

Let R be the relation of congruence modulo 3.

Equivalence classes are [7 ], [-4 ], [-6 ], [17 ], [4 ], [27 ], [19].

Concept used:

Let p be any integer, by definition, of an equivalence class

[p]={x∈Z|x≡p(modn)}={x∈Z|x−p=kn for some k∈Z}

Calculation:

R=Relation of congruence modulo 3.

Let us first determine which equivalence classes are equal to the equivalence class of 7. The equivalence class of a is equal to the equivalence class of 7 if and only if a≡7 mod 3 that is if and only if 3 divides a − 7.

Equivalence class a − 7     3 divides a − 7     Equal to equivalence class [7]

[−4] − 4 − 7 = − 11     No     No

[−6] − 6 − 7 = − 13     No     No

[17] 17 − 7 = 10     No     No

[4] 4 − 7 = − 3     Yes     Yes

[27] 27 − 7 = 20     No     No

[19] 19 − 7 = 12     Yes     Yes

This implies: [7]=[4]=[19].

Next determine which equivalence classes are equal to the equivalence class of − 4. The equivalence class of a is equal to the equivalence class of − 4 if and only if a≡−4 mod 3 if and only if 3 divides a − (- 4). Note: you only need to check the remaining equivalence classes that were unequal to the equivalence class [7]

To determine

(b)

The equal equivalence classes.

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Chapter 8 Solutions

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Sect-8.1 P-1TYSect-8.1 P-2TYSect-8.1 P-3TYSect-8.1 P-4TYSect-8.1 P-5TYSect-8.1 P-1ESSect-8.1 P-2ESSect-8.1 P-3ESSect-8.1 P-4ESSect-8.1 P-5ES
Sect-8.1 P-6ESSect-8.1 P-7ESSect-8.1 P-8ESSect-8.1 P-9ESSect-8.1 P-10ESSect-8.1 P-11ESSect-8.1 P-12ESSect-8.1 P-13ESSect-8.1 P-14ESSect-8.1 P-15ESSect-8.1 P-16ESSect-8.1 P-17ESSect-8.1 P-18ESSect-8.1 P-19ESSect-8.1 P-20ESSect-8.1 P-21ESSect-8.1 P-22ESSect-8.1 P-23ESSect-8.1 P-24ESSect-8.2 P-1TYSect-8.2 P-2TYSect-8.2 P-3TYSect-8.2 P-4TYSect-8.2 P-5TYSect-8.2 P-6TYSect-8.2 P-7TYSect-8.2 P-8TYSect-8.2 P-9TYSect-8.2 P-10TYSect-8.2 P-1ESSect-8.2 P-2ESSect-8.2 P-3ESSect-8.2 P-4ESSect-8.2 P-5ESSect-8.2 P-6ESSect-8.2 P-7ESSect-8.2 P-8ESSect-8.2 P-9ESSect-8.2 P-10ESSect-8.2 P-11ESSect-8.2 P-12ESSect-8.2 P-13ESSect-8.2 P-14ESSect-8.2 P-15ESSect-8.2 P-16ESSect-8.2 P-17ESSect-8.2 P-18ESSect-8.2 P-19ESSect-8.2 P-20ESSect-8.2 P-21ESSect-8.2 P-22ESSect-8.2 P-23ESSect-8.2 P-24ESSect-8.2 P-25ESSect-8.2 P-26ESSect-8.2 P-27ESSect-8.2 P-28ESSect-8.2 P-29ESSect-8.2 P-30ESSect-8.2 P-31ESSect-8.2 P-32ESSect-8.2 P-33ESSect-8.2 P-34ESSect-8.2 P-35ESSect-8.2 P-36ESSect-8.2 P-37ESSect-8.2 P-38ESSect-8.2 P-39ESSect-8.2 P-40ESSect-8.2 P-41ESSect-8.2 P-42ESSect-8.2 P-43ESSect-8.2 P-44ESSect-8.2 P-45ESSect-8.2 P-46ESSect-8.2 P-47ESSect-8.2 P-48ESSect-8.2 P-49ESSect-8.2 P-50ESSect-8.2 P-51ESSect-8.2 P-52ESSect-8.2 P-53ESSect-8.2 P-54ESSect-8.2 P-55ESSect-8.2 P-56ESSect-8.3 P-1TYSect-8.3 P-2TYSect-8.3 P-3TYSect-8.3 P-4TYSect-8.3 P-5TYSect-8.3 P-6TYSect-8.3 P-1ESSect-8.3 P-2ESSect-8.3 P-3ESSect-8.3 P-4ESSect-8.3 P-5ESSect-8.3 P-6ESSect-8.3 P-7ESSect-8.3 P-8ESSect-8.3 P-9ESSect-8.3 P-10ESSect-8.3 P-11ESSect-8.3 P-12ESSect-8.3 P-13ESSect-8.3 P-14ESSect-8.3 P-15ESSect-8.3 P-16ESSect-8.3 P-17ESSect-8.3 P-18ESSect-8.3 P-19ESSect-8.3 P-20ESSect-8.3 P-21ESSect-8.3 P-22ESSect-8.3 P-23ESSect-8.3 P-24ESSect-8.3 P-25ESSect-8.3 P-26ESSect-8.3 P-27ESSect-8.3 P-28ESSect-8.3 P-29ESSect-8.3 P-30ESSect-8.3 P-31ESSect-8.3 P-32ESSect-8.3 P-33ESSect-8.3 P-34ESSect-8.3 P-35ESSect-8.3 P-36ESSect-8.3 P-37ESSect-8.3 P-38ESSect-8.3 P-39ESSect-8.3 P-40ESSect-8.3 P-41ESSect-8.3 P-42ESSect-8.3 P-43ESSect-8.3 P-44ESSect-8.3 P-45ESSect-8.3 P-46ESSect-8.3 P-47ESSect-8.4 P-1TYSect-8.4 P-2TYSect-8.4 P-3TYSect-8.4 P-4TYSect-8.4 P-5TYSect-8.4 P-6TYSect-8.4 P-7TYSect-8.4 P-8TYSect-8.4 P-9TYSect-8.4 P-10TYSect-8.4 P-1ESSect-8.4 P-2ESSect-8.4 P-3ESSect-8.4 P-4ESSect-8.4 P-5ESSect-8.4 P-6ESSect-8.4 P-7ESSect-8.4 P-8ESSect-8.4 P-9ESSect-8.4 P-10ESSect-8.4 P-11ESSect-8.4 P-12ESSect-8.4 P-13ESSect-8.4 P-14ESSect-8.4 P-15ESSect-8.4 P-16ESSect-8.4 P-17ESSect-8.4 P-18ESSect-8.4 P-19ESSect-8.4 P-20ESSect-8.4 P-21ESSect-8.4 P-22ESSect-8.4 P-23ESSect-8.4 P-24ESSect-8.4 P-25ESSect-8.4 P-26ESSect-8.4 P-27ESSect-8.4 P-28ESSect-8.4 P-29ESSect-8.4 P-30ESSect-8.4 P-31ESSect-8.4 P-32ESSect-8.4 P-33ESSect-8.4 P-34ESSect-8.4 P-35ESSect-8.4 P-36ESSect-8.4 P-37ESSect-8.4 P-38ESSect-8.4 P-39ESSect-8.4 P-40ESSect-8.4 P-41ESSect-8.4 P-42ESSect-8.4 P-43ESSect-8.5 P-1TYSect-8.5 P-2TYSect-8.5 P-3TYSect-8.5 P-4TYSect-8.5 P-5TYSect-8.5 P-6TYSect-8.5 P-7TYSect-8.5 P-8TYSect-8.5 P-9TYSect-8.5 P-10TYSect-8.5 P-1ESSect-8.5 P-2ESSect-8.5 P-3ESSect-8.5 P-4ESSect-8.5 P-5ESSect-8.5 P-6ESSect-8.5 P-7ESSect-8.5 P-8ESSect-8.5 P-9ESSect-8.5 P-10ESSect-8.5 P-11ESSect-8.5 P-12ESSect-8.5 P-13ESSect-8.5 P-14ESSect-8.5 P-15ESSect-8.5 P-16ESSect-8.5 P-17ESSect-8.5 P-18ESSect-8.5 P-19ESSect-8.5 P-20ESSect-8.5 P-21ESSect-8.5 P-22ESSect-8.5 P-23ESSect-8.5 P-24ESSect-8.5 P-25ESSect-8.5 P-26ESSect-8.5 P-27ESSect-8.5 P-28ESSect-8.5 P-29ESSect-8.5 P-30ESSect-8.5 P-31ESSect-8.5 P-32ESSect-8.5 P-33ESSect-8.5 P-34ESSect-8.5 P-35ESSect-8.5 P-36ESSect-8.5 P-37ESSect-8.5 P-38ESSect-8.5 P-39ESSect-8.5 P-40ESSect-8.5 P-41ESSect-8.5 P-42ESSect-8.5 P-43ESSect-8.5 P-44ESSect-8.5 P-45ESSect-8.5 P-46ESSect-8.5 P-47ESSect-8.5 P-48ESSect-8.5 P-49ESSect-8.5 P-50ESSect-8.5 P-51ES
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