Let K and E be the extension of a field F with [K: F] finite and assume that both K and E ar subfields of some larger field. If K is a Galois extension of F then KE is a Glois extension of E and G(KE, E) = G(K, KNE).
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- 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]8. Prove that the characteristic of a field is either 0 or a prime.Each of the polynomials in Exercises is irreducible over the given field . Find all zeros of in the field obtained by adjoining a zero of to . (In Exercises and , has three zeros in .)
- Prove that if R is a field, then R has no nontrivial ideals.Since 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.Prove that a polynomial f(x) of positive degree n over the field F has at most n (not necessarily distinct) zeros in F.
- Let be a field. Prove that if is a zero of then is a zero of14. Prove or disprove that is a field if is a field.Consider the set S={[0],[2],[4],[6],[8],[10],[12],[14],[16]}18, with addition and multiplication as defined in 18. a. Is S an integral domain? If not, give a reason. b. Is S a field? If not, give a reason. [Type here][Type here]