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- [Type here] Examples 5 and 6 of Section 5.1 showed that is a commutative ring with unity. In Exercises 4 and 5, let . 4. Is an integral domain? If not, find all zero divisors in . [Type here]Prove that every ideal of n is a principal ideal. (Hint: See corollary 3.27.)34. If is an ideal of prove that the set is an ideal of . The set is called the annihilator of the ideal . Note the difference between and (of Exercise 24), where is the annihilator of an ideal and is the annihilator of an element of.
- . a. Let, and . Show that and are only ideals of and hence is a maximal ideal. b. Show that is not a field. Hence Theorem is not true if the condition that is commutative is removed. Theorem 6.22 Quotient Rings That are Fields. Let be a commutative ring with unity, and let be an ideal of . Then is a field if and only if is a maximal ideal of .[Type here] Examples 5 and 6 of Section 5.1 showed that is a commutative ring with unity. In Exercises 4 and 5, let 6. Let where and are the elements of. Equality, addition, and multiplication are defined in as follows: if and only if and in , a. Prove that multiplication inis associative. Assume thatis a ring and consider these questions, giving a reason for any negative answers. b. Isa commutative ring? c. Doeshave a unity? d. Isan integral domain? e. Isa field? [Type here]18. Find subrings and of such that is not a subring of .