A Classical Introduction to Galois Theory

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Author(s):	Newman, Stephen C.
ISBN No.:	9781118336816
Pages:	296
Year:	201205
Format:	E-Book
Price:	$ 150.44
Status:	Out Of Print

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Preface xi 1 Classical Formulas 1 1.1 Quadratic Polynomials 3 1.2 Cubic Polynomials 5 1.3 Quartic Polynomials 11 2 Polynomials and Field Theory 15 2.1 Divisibility 16 2.2 Algebraic Extensions 24 2.3 Degree of Extensions 25 2.4 Derivatives 29 2.

5 Primitive Element Theorem 30 2.6 Isomorphism Extension Theorem and Splitting Fields 35 3 Fundamental Theorem on Symmetric Polynomials and Discriminants 41 3.1 Fundamental Theorem on Symmetric Polynomials 41 3.2 Fundamental Theorem on Symmetric Rational Functions 48 3.3 Some Identities Based on Elementary Symmetric Polynomials 50 3.4 Discriminants 53 3.5 Discriminants and Subfields of the Real Numbers 60 4 Irreducibility and Factorization 65 4.1 Irreducibility Over the Rational Numbers 65 4.

2 Irreducibility and Splitting Fields 69 4.3 Factorization and Adjunction 72 5 Roots of Unity and Cyclotomic Polynomials 80 5.1 Roots of Unity 80 5.2 Cyclotomic Polynomials 82 6 Radical Extensions and Solvability by Radicals 89 6.1 Basic Results on Radical Extensions 89 6.2 Gauss's Theorem on Cyclotomic Polynomials 93 6.3 Abel's Theorem on Radical Extensions 104 6.4 Polynomials of Prime Degree 109 7 General Polynomials and the Beginnings of Galois Theory 117 7.

1 General Polynomials 117 7.2 The Beginnings of Galois Theory 124 8 Classical Galois Theory According to Galois 135 9 Modern Galois Theory 151 9.1 Galois Theory and Finite Extensions 152 9.2 Galois Theory and Splitting Fields 156 10 Cyclic Extensions and Cyclotomic Fields 171 10.1 Cyclic Extensions 171 10.2 Cyclotomic Fields 179 11 Galois's Criterion for Solvability of Polynomials by Radicals 185 12 Polynomials of Prime degree 192 13 Periods of Roots of Unity 200 14 Denesting Radicals 225 15 Classical Formulas Revisited 231 15.1 General Quadratic Polynomial 231 15.2 General Cubic Polynomial 233 15.

3 General Quartic Polynomial 236 Appendix A Cosets and Group Actions 245 Appendix B Cyclic Groups 249 Appendix C Solvable Groups 254 Appendix D Permutation Groups 261 Appendix E Finite fields and Number Theory 270 Appendix F Further Reading 274 References 277 Index 281.

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