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Homework Help: Construct fields of each of the following orders

  1. Nov 4, 2008 #1
    Construct fields of each of the following orders: [tex]\textbf{(a)}[/tex] 9 [tex]\textbf{(b)}[/tex] 49 [tex]\textbf{(c)}[/tex] 8 [tex]\textbf{(d)}[/tex] 81 (you may exhibit these as [tex]\frac{F[x]}{(f(x))}[/tex] for some [tex]F[/tex] and [tex]f[/tex]).

    Relevant Theorems to use:
    [tex]\textbf{(1.)}[/tex] Let [tex]f(x)[/tex] be a polynomial in [tex]F[x][/tex]. [tex]\frac{F[x]}{(f(x))}[/tex] is a field iff [tex]f(x)[/tex] is irreducible.

    [tex]\textbf{(2.)}[/tex] [tex]F[/tex] is a finite field of order [tex]q[/tex] and let [tex]f(x)[/tex] be a polynomial in [tex]F[x][/tex] of degree [tex]n \geq 1[/tex]. Then [tex]\frac{F[x]}{(f(x))}[/tex] has [tex]q^n[/tex] elements
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Nov 4, 2008 #2


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    Staff Emeritus
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    Gold Member

    I think you should use the two theorems
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