Let F be a field and let f(x) be a polynomial in F[x] that is reducible over F. Then * < f(x) > is a prime ideal but not maximal in F[x] is maximal in F[x] None of the choices is not a prime ideal in F[x]
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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]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 overLet S be a nonempty subset of an order field F. Write definitions for lower bound of S and greatest lower bound of S. Prove that if F is a complete ordered field and the nonempty subset S has a lower bound in F, then S has a greatest lower bound in F.
- True or False Label each of the following statements as either true or false. 4. Any polynomial of positive degree over the field has exactly distinct zeros in .Prove the Unique Factorization Theorem in (Theorem). Theorem Unique Factorisation Theorem Every polynomial of positive degree over the field can be expressed as a product of its leading coefficient and a finite number of monic irreducible polynomials over . This factorization is unique except for the order of the factors.Determine which subset in Exercise 5 are ideals of R[x] and which are principal ideals. Justify your choices. Decide whether each of the following subset is a subring of R[x], and justify your decision in each case. The set of all polynomials with zero constant term. The set of all polynomials that have zero coefficients for all even powers of x. The set of all polynomials that have zero coefficients for all odd powers of x. The set consisting of the zero polynomials together with all polynomials that have degree 2 or less.
- Prove Theorem If and are relatively prime polynomials over the field and if in , then in .18. Let be the smallest subring of the field of rational numbers that contains . Find a description for a typical element of .Prove that if F is an ordered field with F+ as its set of positive elements, then F+nen+, where e denotes the multiplicative identity in F. (Hint: See Theorem 5.34 and its proof.) Theorem 5.34: Well-Ordered D+ If D is an ordered integral domain in which the set D+ of positive elements is well-ordered, then e is the least element of D+ and D+=nen+.
- 8. Prove that the characteristic of a field is either 0 or a prime.Prove that any field that contains an intergral domain D must contain a subfield isomorphic to the quotient field Q of D.Let F be a field and f(x)=a0+a1x+...+anxnF[x]. Prove that x1 is a factor of f(x) if and only if a0+a1+...+an=0. Prove that x+1 is a factor of f(x) if and only if a0+a1+...+(1)nan=0.