Consider the quotient ring k defined as follows: k:= Za[X]/(X* +X² +2). (a) Show thatk is a finite field and compute its order. (b) What is the order of the multiplicative group k*? By Lagrange's Theorem, what are the possible values for the order of an element of k*? (c) Show that for every integer d 1, there are at most d elements of k of order d. (Hint: What equation does an element of order d satisfy?) (d) Use the previous parts to show that the group k is cyclic.
Consider the quotient ring k defined as follows: k:= Za[X]/(X* +X² +2). (a) Show thatk is a finite field and compute its order. (b) What is the order of the multiplicative group k*? By Lagrange's Theorem, what are the possible values for the order of an element of k*? (c) Show that for every integer d 1, there are at most d elements of k of order d. (Hint: What equation does an element of order d satisfy?) (d) Use the previous parts to show that the group k is cyclic.
Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter5: Rings, Integral Domains, And Fields
Section5.3: The Field Of Quotients Of An Integral Domain
Problem 13E
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