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- If a0 in a field F, prove that for every bF the equation ax=b has a unique solution x in F. [Type here][Type here]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]True or False Label each of the following statements as either true or false. For each in a field , the value is unique, where
- Prove Theorem If and are relatively prime polynomials over the field and if in , then 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 .Let where is a field and let . Prove that if is irreducible over , then is irreducible over .
- 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 . , ,[Type here] True or False Label each of the following statements as either true or false. 3. Every integral domain is a field. [Type here]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.
- 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 .)8. Prove that the characteristic of a field is either 0 or a prime.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