(Fundamental theorem an module homomorphism) Let M, M' be an R-module homomorphism. Then Ker (f) is a submodule quivalently, every homomorphic image of an R-module is isomorp
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- 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 .22. Let be a ring with finite number of elements. Show that the characteristic of divides .Exercises Prove Theorem 5.3:A subset S of the ring R is a subring of R if and only if these conditions are satisfied: S is nonempty. xS and yS imply that x+y and xy are in S. xS implies xS.
- [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]Let R be a ring, and let x,y, and z be arbitrary elements of R. Complete the proof of Theorem 5.11 by proving the following statements. a. x(y)=(xy) b. (x)(y)=xy c. x(yz)=xyxz d. (xy)z=xzyz Theorem 5.11 Additive Inverses and Products For arbitrary x,y, and z in a ring R, the following equalities hold: (x)y=(xy) b. x(y)=(xy) (x)(y)=xy d. x(yz)=xyxz (xy)z=xzyzLet R be a commutative ring with characteristic 2. Show that each of the following is true for all x,yR a. (x+y)2=x2+y2 b. (x+y)4=x4+y4
- 32. a. Let be an ideal of the commutative ring and . Prove that the setis an ideal of containing . b. If and show that .28. For each, define by for. a. Show that is an element of . b. Let .Prove that is a subgroup of under mapping composition. c. Prove that is abelian, even though is not.Describe the kernel of epimorphism in Exercise 20. Consider the mapping :Z[ x ]Zk[ x ] defined by (a0+a1x++anxn)=[ a0 ]+[ a1 ]x++[ an ]xn, where [ ai ] denotes the congruence class of Zk that contains ai. Prove that is an epimorphism from Z[ x ] to Zk[ x ].
- 18. Find subrings and of such that is not a subring of .14. Let be a ring with unity . Verify that the mapping defined by is a homomorphism.True or False Label each of the following statements as either true or false. 1. Every ring is an abelian group with respect to the operations of addition and multiplication.