1. Let D be a quasilocal PID (that is, a PID with a unique maximal ideal). Prove that for all a, b e D, either a b or b|a.
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- 29. Let be the set of Gaussian integers . Let . a. Prove or disprove that is a substring of . b. Prove or disprove that is an ideal of .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.14. Let be an ideal in a ring with unity . Prove that if then .
- 18. Find subrings and of such that is not a subring of .Find the principal ideal (z) of Z such that each of the following sums as defined in Exercise 8 is equal to (z). (2)+(3) b. (4)+(6) c. (5)+(10) d. (a)+(b) If I1 and I2 are two ideals of the ring R, prove that the set I1+I2=x+yxI1,yI2 is an ideal of R that contains each of I1 and I2. The ideal I1+I2 is called the sum of ideals of I1 and I2.24. If is a commutative ring and is a fixed element of prove that the setis an ideal of . (The set is called the annihilator of in the ring .)
- 9. If denotes the unity element in an integral domain prove that for all .True or false Label each of the following statements as either true or false. 6. Every ideal of is a principal ideal.Let R be as in Exercise 1, and show that the principal ideal I=(2)={2n+m2|n,m} is a maximal ideal of R. Exercise 1. According to part a of Example 3 in Section 5.1, the set R={m+n2|m,n} is a ring. Assume that the set I={a+b2|aE,bE} is an ideal of R, and show that I is not a maximal ideal of R.
- 31. Prove statement of Theorem : for all integers and .Find a principal ideal (z) of such that each of the following products as defined in Exercise 10 is equal to (z). a. (2)(3)(4)(5)(4)(8)(a)(b)Let R be a commutative ring that does not have a unity. For a fixed aR, prove that the set (a)={na+ra|n,rR} is an ideal of R that contains the element a. (This ideal is called the principal ideal of R that is generated by a. )