Let E be a field and , 6E E be nonzero polynomials. (a) If ab and a, prove that a = db for some nonzero d E E (b) If e gcd(a, b) and E Eis a common divisor of a and b of highest possible degree, prove that i= de for some nonzero d E E
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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]Let be a field. Prove that if is a zero of then is a zero ofSuppose 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.
- Prove that if R and S are fields, then the direct sum RS is not a field. [Type here][Type here]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.8. Prove that the characteristic of a field is either 0 or a prime.
- Let ab in a field F. Show that x+a and x+b are relatively prime in F[x].If is a finite field with elements, and is a polynomial of positive degree over , find a formula for the number of elements in the ring .Corollary requires that be a field. Show that each of the following polynomials of positive degree has more than zeros over where is not a field. over over
- Label each of the following as either true or false. If a set S is not an integral domain, then S is not a field. [Type here][Type here]In Exercises , a field , a polynomial over , and an element of the field obtained by adjoining a zero of to are given. In each case: Verify that is irreducible over . Write out a formula for the product of two arbitrary elements and of . Find the multiplicative inverse of the given element of . , ,Prove that if R is a field, then R has no nontrivial ideals.