1. Prove that an algebraically closed field is infinite.
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- Prove that if R and S are fields, then the direct sum RS is not a field. [Type here][Type here]Prove that any ordered field must contain a subfield that is isomorphic to the field of rational numbers.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]
- Prove Corollary 8.18: A polynomial of positive degree over the field has at most distinct zeros inLet ab in a field F. Show that x+a and x+b are relatively prime in F[x].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]
- 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+.Prove that a polynomial f(x) of positive degree n over the field F has at most n (not necessarily distinct) zeros in F.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.