(a) Assume p is prime. Show that there are (p- 1)/2 irreducible polynomials of the form f(x) = x² – b in Z,[r]. (b) Show that for every prime p, there exists a field with p2 elements.
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- True or False Label each of the following statements as either true or false. Every polynomial equation of degree over a field can be solved over an extension field of .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 . , ,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 any field that contains an intergral domain D must contain a subfield isomorphic to the quotient field Q of D.18. Let be the smallest subring of the field of rational numbers that contains . Find a description for a typical element of .Let ab in a field F. Show that x+a and x+b are relatively prime in F[x].
- Prove that a polynomial f(x) of positive degree n over the field F has at most n (not necessarily distinct) zeros in F.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.Use Theorem to show that each of the following polynomials is irreducible over the field of rational numbers. Theorem Irreducibility of in Suppose is a polynomial of positive degree with integral coefficients and is a prime integer that does not divide. Let Where for If is irreducible in then is irreducible in .