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AlgebraElements Of Modern Algebra8th Edition

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Chapter 3.1, Problem 30E
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Elements Of Modern Algebra

8th Edition
Gilbert + 2 others
ISBN: 9781285463230

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Problem 25E
Problem 26E
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Problem 30E
Problem 31E
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Problem 49E
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Elements Of Modern Algebra

8th Edition
Gilbert + 2 others
ISBN: 9781285463230
Textbook Problem
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In Exercises 25 − 32 , decide whether each of the given sets is a group with respect to the indicated operation. If it is not a group, state all of the conditions in Definition 3.1 that fail to hold. If it is a group, state its order.

The set { [ 0 ] , [ 2 ] , [ 4 ] , [ 6 ] , [ 8 ] } ⊆ ℤ 10 with operation multiplication.

To determine

Whether the set {[0],[2],[4],[6],[8]}⊆ℤ10 is a group with operation multiplication. State which, if any, conditions fail to hold. If it is a group, then state its order.

Explanation

Given information:

The set {[0],[2],[4],[6],[8]}⊆ℤ10 with operation multiplication

Explanation:

Definition of a group:

Suppose the binary operation ∗ is defined for element of set G. Then G is a group with respect to ∗, provided the following conditions hold:

1. G is closed under ∗. That is, x∈G and y∈G imply that x∗y is in G.

2. ∗ is associative. For all x,y,z in G, x∗(y∗z)=(x∗y)∗z.

3. G has an identity element e. There is an e in G such that x∗e=e∗x=x for all x∈G.

4. G contains inverses. For each a∈G, there exists b∈G such that a∗b=b∗a=e.

Definition of order of group:

The number of elements in group G is called the order of G, and it is denoted by either o(G) or |G|.

To check the conditions of a group for the set S={[0],[2],[4],[6],[8]}⊆ℤ10 with operation multiplication, where ℤ10={[0],[1],[2],[3],[4],[5],[6],[7],[8],[9]}, use the table form as below:

â‹…[0][2][4][6][8][0][0][0][0][0][

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Sect-3.1 P-1TFESect-3.1 P-2TFESect-3.1 P-3TFESect-3.1 P-4TFESect-3.1 P-5TFESect-3.1 P-6TFESect-3.1 P-7TFESect-3.1 P-8TFESect-3.1 P-9TFESect-3.1 P-10TFE
Sect-3.1 P-11TFESect-3.1 P-1ESect-3.1 P-2ESect-3.1 P-3ESect-3.1 P-4ESect-3.1 P-5ESect-3.1 P-6ESect-3.1 P-7ESect-3.1 P-8ESect-3.1 P-9ESect-3.1 P-10ESect-3.1 P-11ESect-3.1 P-12ESect-3.1 P-13ESect-3.1 P-14ESect-3.1 P-15ESect-3.1 P-16ESect-3.1 P-17ESect-3.1 P-18ESect-3.1 P-19ESect-3.1 P-20ESect-3.1 P-21ESect-3.1 P-22ESect-3.1 P-23ESect-3.1 P-24ESect-3.1 P-25ESect-3.1 P-26ESect-3.1 P-27ESect-3.1 P-28ESect-3.1 P-29ESect-3.1 P-30ESect-3.1 P-31ESect-3.1 P-32ESect-3.1 P-33ESect-3.1 P-34ESect-3.1 P-35ESect-3.1 P-36ESect-3.1 P-37ESect-3.1 P-38ESect-3.1 P-39ESect-3.1 P-40ESect-3.1 P-41ESect-3.1 P-42ESect-3.1 P-43ESect-3.1 P-44ESect-3.1 P-45ESect-3.1 P-46ESect-3.1 P-47ESect-3.1 P-48ESect-3.1 P-49ESect-3.1 P-50ESect-3.1 P-51ESect-3.1 P-52ESect-3.2 P-1TFESect-3.2 P-2TFESect-3.2 P-3TFESect-3.2 P-4TFESect-3.2 P-5TFESect-3.2 P-6TFESect-3.2 P-1ESect-3.2 P-2ESect-3.2 P-3ESect-3.2 P-4ESect-3.2 P-5ESect-3.2 P-6ESect-3.2 P-7ESect-3.2 P-8ESect-3.2 P-9ESect-3.2 P-10ESect-3.2 P-11ESect-3.2 P-12ESect-3.2 P-13ESect-3.2 P-14ESect-3.2 P-15ESect-3.2 P-16ESect-3.2 P-17ESect-3.2 P-18ESect-3.2 P-19ESect-3.2 P-20ESect-3.2 P-21ESect-3.2 P-22ESect-3.2 P-23ESect-3.2 P-24ESect-3.2 P-25ESect-3.2 P-26ESect-3.2 P-27ESect-3.2 P-28ESect-3.2 P-29ESect-3.2 P-30ESect-3.2 P-31ESect-3.2 P-32ESect-3.3 P-1TFESect-3.3 P-2TFESect-3.3 P-3TFESect-3.3 P-4TFESect-3.3 P-5TFESect-3.3 P-6TFESect-3.3 P-7TFESect-3.3 P-8TFESect-3.3 P-9TFESect-3.3 P-10TFESect-3.3 P-11TFESect-3.3 P-1ESect-3.3 P-2ESect-3.3 P-3ESect-3.3 P-4ESect-3.3 P-5ESect-3.3 P-6ESect-3.3 P-7ESect-3.3 P-8ESect-3.3 P-9ESect-3.3 P-10ESect-3.3 P-11ESect-3.3 P-12ESect-3.3 P-13ESect-3.3 P-14ESect-3.3 P-15ESect-3.3 P-16ESect-3.3 P-17ESect-3.3 P-18ESect-3.3 P-19ESect-3.3 P-20ESect-3.3 P-21ESect-3.3 P-22ESect-3.3 P-23ESect-3.3 P-24ESect-3.3 P-25ESect-3.3 P-26ESect-3.3 P-27ESect-3.3 P-28ESect-3.3 P-29ESect-3.3 P-30ESect-3.3 P-31ESect-3.3 P-32ESect-3.3 P-33ESect-3.3 P-34ESect-3.3 P-35ESect-3.3 P-36ESect-3.3 P-37ESect-3.3 P-38ESect-3.3 P-39ESect-3.3 P-40ESect-3.3 P-41ESect-3.3 P-42ESect-3.3 P-43ESect-3.3 P-44ESect-3.3 P-45ESect-3.4 P-1TFESect-3.4 P-2TFESect-3.4 P-3TFESect-3.4 P-4TFESect-3.4 P-5TFESect-3.4 P-6TFESect-3.4 P-7TFESect-3.4 P-8TFESect-3.4 P-9TFESect-3.4 P-10TFESect-3.4 P-1ESect-3.4 P-2ESect-3.4 P-3ESect-3.4 P-4ESect-3.4 P-5ESect-3.4 P-6ESect-3.4 P-7ESect-3.4 P-8ESect-3.4 P-9ESect-3.4 P-10ESect-3.4 P-11ESect-3.4 P-12ESect-3.4 P-13ESect-3.4 P-14ESect-3.4 P-15ESect-3.4 P-16ESect-3.4 P-17ESect-3.4 P-18ESect-3.4 P-19ESect-3.4 P-20ESect-3.4 P-21ESect-3.4 P-22ESect-3.4 P-23ESect-3.4 P-24ESect-3.4 P-25ESect-3.4 P-26ESect-3.4 P-27ESect-3.4 P-28ESect-3.4 P-29ESect-3.4 P-30ESect-3.4 P-31ESect-3.4 P-32ESect-3.4 P-33ESect-3.4 P-34ESect-3.4 P-35ESect-3.4 P-36ESect-3.4 P-37ESect-3.4 P-38ESect-3.4 P-39ESect-3.4 P-40ESect-3.4 P-41ESect-3.4 P-42ESect-3.5 P-1TFESect-3.5 P-2TFESect-3.5 P-3TFESect-3.5 P-4TFESect-3.5 P-5TFESect-3.5 P-6TFESect-3.5 P-7TFESect-3.5 P-8TFESect-3.5 P-1ESect-3.5 P-2ESect-3.5 P-3ESect-3.5 P-4ESect-3.5 P-5ESect-3.5 P-6ESect-3.5 P-7ESect-3.5 P-8ESect-3.5 P-9ESect-3.5 P-10ESect-3.5 P-11ESect-3.5 P-12ESect-3.5 P-13ESect-3.5 P-14ESect-3.5 P-15ESect-3.5 P-16ESect-3.5 P-17ESect-3.5 P-18ESect-3.5 P-19ESect-3.5 P-20ESect-3.5 P-21ESect-3.5 P-22ESect-3.5 P-23ESect-3.5 P-24ESect-3.5 P-25ESect-3.5 P-26ESect-3.5 P-27ESect-3.5 P-28ESect-3.5 P-29ESect-3.5 P-30ESect-3.5 P-31ESect-3.5 P-32ESect-3.5 P-33ESect-3.5 P-34ESect-3.5 P-35ESect-3.5 P-36ESect-3.5 P-37ESect-3.5 P-38ESect-3.5 P-39ESect-3.6 P-1TFESect-3.6 P-2TFESect-3.6 P-3TFESect-3.6 P-4TFESect-3.6 P-5TFESect-3.6 P-6TFESect-3.6 P-7TFESect-3.6 P-8TFESect-3.6 P-9TFESect-3.6 P-10TFESect-3.6 P-1ESect-3.6 P-2ESect-3.6 P-3ESect-3.6 P-4ESect-3.6 P-5ESect-3.6 P-6ESect-3.6 P-7ESect-3.6 P-8ESect-3.6 P-9ESect-3.6 P-10ESect-3.6 P-11ESect-3.6 P-12ESect-3.6 P-13ESect-3.6 P-14ESect-3.6 P-15ESect-3.6 P-16ESect-3.6 P-17ESect-3.6 P-18ESect-3.6 P-19ESect-3.6 P-20ESect-3.6 P-21ESect-3.6 P-22ESect-3.6 P-23ESect-3.6 P-24ESect-3.6 P-25E

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