First Course inAbstract Algebra A
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, CONTENTS
1. Sets and Relations
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I. Groups and Subgroups l l l l
2. Introduction and Examples 4 ll ll
3. Binary Operations 7 l l
4. Isomorphic Binary Structures 9 l l l l
5. Groups 13
6. Subgroups 17
7. Cyclic Groups 21
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8. Generators and Cayley Digraphs 24 ll ll ll
II. Permutations, Cosets, and Direct Products ll ll ll ll
9. Groups of Permutations 26 ll ll
10. Orbits, Cycles, and the Alternating Groups ll ll ll ll ll
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11. Cosets and the Theorem of Lagrange
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12. Direct Products and Finitely Generated Abelian Groups 37
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13. Plane Isometries 42
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III. Homomorphisms and Factor Groups l l ll ll
14. Homomorphisms 44
15. Factor Groups 49 ll
16. Factor-Group Computations and Simple Groups ll l l ll ll 53
17. Group Action on a Set
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18. Applications of G-Sets to Counting 61 l l l l
IV. Rings and Fields l l l l
19. Rings and Fields 63
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20. Integral Domains 68 ll
21. Fermat’s and Euler’s Theorems 72 ll ll ll
22. The Field of Quotients of an Integral Domain 74
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23. Rings of Polynomials 76
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24. FactorizationofPolynomialsover a Field 79 l l l l l
25. Noncommutative Examples 85 ll
26. Ordered Rings and Fields 87 ll ll ll
V. Ideals and Factor Rings l l l l l l
27. Homomorphisms and Factor Rings ll ll ll 89
28. Prime and Maximal Ideals
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,29. Gröbner Bases for Ideals
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, VI. Extension Fields l l
30. Introduction to Extension Fields l ll ll 103
31. Vector Spaces 107 l l
32. Algebraic Extensions 111 l l
33. GeometricConstructions 115 l
34. Finite Fields 116 ll
VII. Advanced Group Theory ll ll
35. IsomorphismTheorems 117 l
36. Series of Groups 119ll ll
37. Sylow Theorems 122 ll
38. Applications of the Sylow Theory ll ll ll ll 124
39. Free Abelian Groups 128
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40. Free Groups 130
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41. Group Presentations 133 ll
VIII. Groups in Topology l l l l
42. Simplicial Complexes and Homology Groups 136 ll ll ll ll
43. Computations of Homology Groups 138 ll ll ll
44. More Homology Computations and Applications
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45. Homological Algebra 144 l
IX. Factorization
46. Unique Factorization Domains 148 ll ll
47. Euclidean Domains 151 l l
48. Gaussian Integers and Multiplicative Norms ll ll ll ll 154
X. Automorphisms and Galois Theory l l l l l l
49. Automorphisms of Fields 159 ll ll
50. The Isomorphism Extension Theorem
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51. Splitting Fields 165 ll
52. SeparableExtensions 167 l
53. Totally Inseparable Extensions
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54. Galois Theory 173 l l
55. IllustrationsofGaloisTheory 176 l l l
56. CyclotomicExtensions 183 l
57. Insolvability of the Quintic 185 ll ll ll
APPENDIX Matrix Algebra ll l l ll l l 187
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