3 Let I be an ideal of the ring R and define the set ann (1) ={rERIra=o, VaE Prove that ann (I) forms ideals Cann (I)is alled annihd ate of I)
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- 32. a. Let be an ideal of the commutative ring and . Prove that the setis an ideal of containing . b. If and show that .Exercises If and are two ideals of the ring , prove that is an ideal of .Let I be an ideal in a ring R with unity. Prove that if I contains an element a that has a multiplicative inverse, then I=R.
- 17. Suppose is a ring with positive characteristic. Prove that if is any ideal of then is a multiple of the characteristic of.15. Prove that if is an ideal in a commutative ring with unity, then is an ideal in .18. Let be a commutative ring with unity, and let be the principal ideal in . Prove that is isomorphic to .
- Exercises Find two ideals and of the ring such that is not an ideal of . is an ideal of .Exercises Let be an ideal of a ring , and let be a subring of . Prove that is an ideal ofLet 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. )
- 14. Let be a ring with unity . Verify that the mapping defined by is a homomorphism.Let I be the set of all elements of a ring R that have finite additive order. Prove that I is an ideal of R.Exercises 10. Prove Theorem 5.4:A subset of the ring is a subring of if and only if these conditions are satisfied: is nonempty. and imply that and are in .