Abstract Algebra: An Introduction by Thomas W. Hungerford

By Thomas W. Hungerford

Summary ALGEBRA: AN creation is meant for a primary undergraduate direction in sleek summary algebra. Its versatile layout makes it appropriate for classes of varied lengths and varied degrees of mathematical sophistication, starting from a conventional summary algebra path to at least one with a extra utilized taste. The ebook is prepared round subject matters: mathematics and congruence. every one subject is built first for the integers, then for polynomials, and eventually for jewelry and teams, so scholars can see the place many summary options come from, why they're vital, and the way they relate to at least one another.
New Features:
- A groups-first choice that allows those that are looking to hide teams earlier than earrings to take action easily.
- Proofs for newcomers within the early chapters, that are damaged into steps, each one of that's defined and proved in detail.
- within the center direction (chapters 1-8), there are 35% extra examples and thirteen% extra routines.

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Let n be a positive integer. Prove that a and cleave the same remainder when n if and only if a c = nk for some integer k. divided by - 11. Prove the following version of the Division Algorithm, which holds for both positive and negative divisors. Extended Division Algorithm: Let a andb be integers with b :# 0. Then there exist unique integers q a11d rsuch that a= hq + randO s r < JbJ. ] • lb 1- Then consider two cases Divisibility An important case of division occurs when the remainder is 0, that is, when the divisor is a factor of the dividend.

10. 7. 11. Solve the following equations. (a) x®x ®x =[OJinZ 3 (b) x®x ®x ®x =[OJ inZ4 (c) xEBx®x®x®x =[OJ in Zs 12. Prove or disprove: If [aJ 0 [bJ = [OJin Z,,, then [a] = [OJ or [b] = (O]. 13. Prove or disprove: If [a] 0 [bJ =[a] 0 [cJand [a] :f: [ O ] in Z,,, then [bJ =[c]. B. 14. Solve the following equations. (a) x1+x=[OJinZs (b) x2 +x =[O] in� (c) If pis prime, prove that the only solutions of x2+ x =[O] in � are [OJand [p - lJ. 15. Compute the following products. J (d) Based on the results of parts (a)-(c), what do you think ([a]® [b])7 is equal to inZ7?

J*I.. -. lldladlll....... -. 24 Chapter 1 Arithmetic in l. Revisited 24. Prove that a I b if and only if d' I b". 25. Let p be prime and 1 s k 3 is prime, prove that# + 2 is composite. ] 28. Prove or disprove: The sums 1+2+4, 1+2 + 4 + 8, 1+2 + 4 + 8+ 16, ... are alternately prime and composite. 29. : 0 and m is odd. 30. (a) Prove that there are no nonzero integers a, b such that cl= 2b2.

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