Please answer number question 4

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter2: The Integers
Section2.7: Introduction To Coding Theory (optional)
Problem 12E: Suppose that the check digit is computed as described in Example . Prove that transposition errors...
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Please answer number question 4

Fields
Definition: An algebraic system {S, +, ·} consisting of a set S together with two
operations + and , is called a field if it has the following properties.
Va, b, c in S:
A1. Addition is associative: a + (b + c) = (a + b) + c
A2.
Addition is commutative: a + b= b + a
АЗ.
Zero: 3 an element 0 in S such that a + 0 = a
A4.
Opposite: 3 an element -a such that a + -a = 0
M1. Multiplication is associative: a(bc) = (ab)c
M2. Multiplication is commutative: ab = ba
M3. One: 3 an element 1 in S such that la = a
1
M4. Reciprocal: if a z 0,3 an clement - such that a-
D.
Multiplication is distributive over addition: a (b + c) = ab + ac
1. Explain why the integers with + and · are not a field.
2. Explain why the rational numbers with + and are a field.
3. Show that the set of numbers mod 5 with e and ® is a field.
4. Show that the set of numbers mod 6 with e and ® is not a field.
Transcribed Image Text:Fields Definition: An algebraic system {S, +, ·} consisting of a set S together with two operations + and , is called a field if it has the following properties. Va, b, c in S: A1. Addition is associative: a + (b + c) = (a + b) + c A2. Addition is commutative: a + b= b + a АЗ. Zero: 3 an element 0 in S such that a + 0 = a A4. Opposite: 3 an element -a such that a + -a = 0 M1. Multiplication is associative: a(bc) = (ab)c M2. Multiplication is commutative: ab = ba M3. One: 3 an element 1 in S such that la = a 1 M4. Reciprocal: if a z 0,3 an clement - such that a- D. Multiplication is distributive over addition: a (b + c) = ab + ac 1. Explain why the integers with + and · are not a field. 2. Explain why the rational numbers with + and are a field. 3. Show that the set of numbers mod 5 with e and ® is a field. 4. Show that the set of numbers mod 6 with e and ® is not a field.
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