Let K be a finite normal extension of a field F. If a, ß are any two elements of K onjugate over F, then their exists an F - automorphism & of K such that o(a) = ß
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- Prove Theorem If and are relatively prime polynomials over the field and if in , then in .Prove that a polynomial f(x) of positive degree n over the field F has at most n (not necessarily distinct) zeros in F.Prove that any field that contains an intergral domain D must contain a subfield isomorphic to the quotient field Q of D.
- Suppose that f(x),g(x), and h(x) are polynomials over the field F, each of which has positive degree, and that f(x)=g(x)h(x). Prove that the zeros of f(x) in F consist of the zeros of g(x) in F together with the zeros of h(x) in F.Let be an irreducible polynomial over a field . Prove that is irreducible over for all nonzero inSince this section presents a method for constructing a field of quotients for an arbitrary integral domain D, we might ask what happens if D is already a field. As an example, consider the situation when D=5. a. With D=5, write out all the elements of S, sort these elements according to the relation , and then list all the distinct elements of Q. b. Exhibit an isomorphism from D to Q.
- Suppose S is a subset of an field F that contains at least two elements and satisfies both of the following conditions: xS and yS imply xyS, and xS and y0S imply xy1S. Prove that S is a field. This S is called a subfield of F. [Type here][Type here]Prove that if R is a field, then R has no nontrivial ideals.Prove that if f is a permutation on A, then (f1)1=f.