(2a) Prove that product and sum are well-defined, i.e., if f/g = f₁/9₁ and h/k = h₁/k₁, then f/g* h/k = f1/91 * h₁/k₁ for * = - and * = +. (2b) Prove that C(x) is a field.
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The question is in the attached image, please if able give explanation with the taken steps, Im new to abstract algebra.
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- [Type here] 15. Give an example of an infinite commutative ring with no zero divisors that is not an integral domain. [Type here]Prove that if a subring R of an integral domain D contains the unity element of D, then R is an integral domain. [Type here][Type here]46. Let be a set of elements containing the unity, that satisfy all of the conditions in Definition a, except condition: Addition is commutative. Prove that condition must also hold. Definition a Definition of a Ring Suppose is a set in which a relation of equality, denoted by , and operations of addition and multiplication, denoted by and , respectively, are defined. Then is a ring (with respect to these operations) if the following conditions are satisfied: 1. is closed under addition: and imply . 2. Addition in is associative: for all in. 3. contains an additive identity: for all . 4. contains an additive inverse: For in, there exists in such that . 5. Addition in is commutative: for all in . 6. is closed under multiplication: and imply . 7. Multiplication in is associative: for all in. 8. Two distributive laws hold in: and for all in . The notation will be used interchageably with to indicate multiplication.
- 7. Prove that on a given set of rings, the relation of being isomorphic has the reflexive, symmetric, and transitive properties.18. Let be a commutative ring with unity, and let be the principal ideal in . Prove that is isomorphic to .a. If R is a commutative ring with unity, show that the characteristic of R[ x ] is the same as the characteristic of R. b. State the characteristic of Zn[ x ]. c. State the characteristic of Z[ x ].
- 11. a. Give an example of a ring of characteristic 4, and elements in such that b. Give an example of a noncommutative ring with characteristic 4, and elements in such that .Find all monic irreducible polynomials of degree 2 over Z3.Prove that a polynomial f(x) of positive degree n over the field F has at most n (not necessarily distinct) zeros in F.