Let (R,+..) be a ring of real numbers and (Max+..) is a ring of 2×2 matrices over R. Let f:R¬ such that (a)(). Then Ka) fis an isomorphism. 557 b) fis not one-to-one but onto homomorphism. c) fis a homomorphism but not onto and not one-to-one. d) Fis one-to-one but not onto homomorphism.
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- Let R be the set of all matrices of the form [abba], where a and b are real numbers. Assume that R is a commutative ring with unity with respect to matrix addition and multiplication. Answer the following questions and give a reason for any negative answers. Is 12 an integral domain? Is R a field?11. Show that defined by is not a homomorphism.37. Let and be elements in a ring. If is a zero divisor, prove that either or is a zero divisor.
- An element in a ring is idempotent if . Prove that a division ring must contain exactly two idempotent e elements.Let S be the set of all 2X2 matrices of the form [x0x0], where x is a real number.Assume that S is a ring with respect to matrix addition and multiplication. Answer the following questions, and give a reason for any negative answers. Is S a commutative ring? Does S have a unity? If so, identify the unity. Is S an integral domain? Is S a field? [Type here][Type here]Examples 5 and 6 of Section 5.1 showed that P(U) is a commutative ring with unity. In Exercises 4 and 5, let U={a,b}. Is P(U) a field? If not, find all nonzero elements that do not have multiplicative inverses. [Type here][Type here]
- 19. Find a specific example of two elements and in a ring such that and .28. a. Show that the set is a ring with respect to matrix addition and multiplication. b. Is commutative? c. does have a unity? d. Decide whether or not the set is an ideal of and justify your answer.Assume R is a ring with unity e. Prove Theorem 5.8: If aR has a multiplicative inverse, the multiplicative inverse of a is unique.