Consider the Galois field GF(24), with standard addition, and multiplication defined modulo the (primitive, thus irreducible) polynomial P (x) = x4 + x + 1. Over this field, compute the result of multiplying the elements 1101 and 0110. %3D
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- 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.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 .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.
- 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 any field that contains an intergral domain D must contain a subfield isomorphic to the quotient field Q of D.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 .)
- 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 .Prove that a polynomial f(x) of positive degree n over the field F has at most n (not necessarily distinct) zeros in F.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 .
- Let be an irreducible polynomial over a field . Prove that is irreducible over for all nonzero inSuppose 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]