a Show that C = b a commutative ring with unity even if M₂ (R) is not. Finally, show that C is a field. a, b ER is a subring of M₂ (R). Moreover, prove that C is a
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- Exercises If and are two ideals of the ring , prove that is an ideal of .15. Prove that if is an ideal in a commutative ring with unity, then is an ideal in .Let :312 be defined by ([x]3)=4[x]12 using the same notational convention as in Exercise 9. Prove that is a ring homomorphism. Is (e)=e where e is the unity in 3 and e is the unity in 12?
- 22. Let be a ring with finite number of elements. Show that the characteristic of divides .Consider the set S={[0],[2],[4],[6],[8],[10],[12],[14],[16]}18, with addition and multiplication as defined in 18. a. Is S an integral domain? If not, give a reason. b. Is S a field? If not, give a reason. [Type here][Type here]Consider the set ={[0],[2],[4],[6],[8]}10, with addition and multiplication as defined in 10. a. Is R an integral domain? If not, give a reason. b. Is R a field? If not, give a reason. [Type here][Type here]