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- 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. )22. Let be a ring with finite number of elements. Show that the characteristic of divides .
- Exercises If and are two ideals of the ring , prove that is an ideal of .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.36. Suppose that is a commutative ring with unity and that is an ideal of . Prove that the set of all such that for some positive integer is an ideal of .
- 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.Show that the ideal is a maximal ideal of .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 .