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Homework Help: [Abstract Algebra] Maximal Ideal

  1. Feb 26, 2013 #1
    1. The problem statement, all variables and given/known data
    Let F be the field and f(x)=x-1,g(x)=x^2-1 and F[x]/(f(x)) is isomorphism to F, is it g(x) maximal??

    2. The attempt at a solution

    I will say no.Since g(x) is not 0, the dieal (x^2-1) in a prime idea domain F is maximal iff (x^2-1) is irreducible.
    And we say (x^2-1) is irreducible if it is not a unit, but x^2-1=(x+1)(x-1) implies that either (x+1) or (x-1) is a unit.
    but I can find a taylor expansion of 1/(x^2-1) which means (x^2-1) is a unit, contradicts irreducible

    is my idea right ???
  2. jcsd
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