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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 ] } 10 with operation addition.

To determine

Whether the set {[0],[2],[4],[6],[8]}10 is a group with operation addition. 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]}10 with operation addition.

Explanation:

Definition of a group:

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

1. G is closed under . That is, xG and yG imply that xy is in G.

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

3. G has an identity element e. There is an e in G such that xe=ex=x for all xG.

4. G contains inverses. For each aG, there exists bG such that ab=ba=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 E={[0],[2],[4],[6],[8]}10 with addition where 10={[0],[1],[2],[3],[4],[5],[6],[7],[8],[9]}, use the table form as below:

+[0][2][4][6][8][0][0][2][4][6][8][2][2][4][6][8][0][4]

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