(a) Assume p is prime. Show that there are (p- 1)/2 irreducible polynomials of the form f(x) = x² – b in Z,[r]. (b) Show that for every prime p, there exists a field with p2 elements.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter8: Polynomials
Section8.6: Algebraic Extensions Of A Field
Problem 7E
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Exercise 6.3.13
(a) Assume p is prime. Show that there are (p - 1)/2 irreducible polynomials of the form
f(x) = x – b in Z,[r].
(b) Show that for every prime p, there exists a field with p2 elements.
There is actually a formula for the number of irreducible polynomials of degree d over
Z, or any finite field. See Dornhoff and Hohn [25, p. 377].
Transcribed Image Text:Exercise 6.3.13 (a) Assume p is prime. Show that there are (p - 1)/2 irreducible polynomials of the form f(x) = x – b in Z,[r]. (b) Show that for every prime p, there exists a field with p2 elements. There is actually a formula for the number of irreducible polynomials of degree d over Z, or any finite field. See Dornhoff and Hohn [25, p. 377].
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