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| I. | Fourier Series | |
| 1. | Definition of Fourier series | 1 |
| 2. | Orthogonality of sines and cosines | 2 |
| 3. | Determination of the coefficients | 3 |
| 4. | Series of cosines and series of sines | 6 |
| 5. | Examples | 8 |
| 6. | Magnitude of coefficients under special hypotheses | 11 |
| 7. | Riemann's theorem on limit of general coefficient | 14 |
| 8. | Evaluation of a sum of cosines | 17 |
| 9. | Integral formula for partial sum of Fourier series | 17 |
| 10. | Convergence at a point of continuity | 18 |
| 11. | Uniform convergence under special hypotheses | 21 |
| 12. | Convergence at a point of discontinuity | 22 |
| 13. | Sufficiency of conditions relating to a restricted neighborhood | 24 |
| 14. | Weierstrass's theorem on trigonometric approximation | 25 |
| 15. | Least-square property | 27 |
| 16. | Parseval's theorem | 29 |
| 17. | Summation of series | 31 |
| 18. | Fejer's theorem for a continuous function | 32 |
| 19. | Proof of Weierstrass's theorem by means of de la Vallee Poussin's integral | 35 |
| 20. | The Lebesgue constants | 40 |
| 21. | Proof of uniform convergence by the method of Lebesgue | 42 |
| II. | Legendre Polynomials | |
| 1. | Preliminary orientation | 45 |
| 2. | Definition of the Legendre polynomials by means of the generating function | 45 |
| 3. | Recurrence formula | 46 |
| 4. | Differential equation and related formulas | 48 |
| 5. | Orthogonality | 50 |
| 6. | Normalizing factor | 51 |
| 7. | Expansion of an arbitrary function in series | 53 |
| 8. | Christoffel's identity | 54 |
| 9. | Solution of the differential equation | 55 |
| 10. | Rodrigues's formula | 57 |
| 11. | Integral representation | 58 |
| 12. | Bounds of P[subscript n](x) | 61 |
| 13. | Convergence at a point of continuity interior to the interval | 63 |
| 14. | Convergence at a point of discontinuity interior to the interval | 65 |
| III. | Bessel Functions | |
| 1. | Preliminary orientation | 69 |
| 2. | Definition of J[subscript 0](x) | 69 |
| 3. | Orthogonality | 71 |
| 4. | Integral representation of J[subscript 0](x) | 74 |
| 5. | Zeros of J[subscript 0](x) and related functions | 76 |
| 6. | Expansion of an arbitrary function in series | 79 |
| 7. | Definition of J[subscript n](x) | 80 |
| 8. | Orthogonality: developments in series | 82 |
| 9. | Integral representation of J[subscript n](x) | 84 |
| 10. | Recurrence formulas | 85 |
| 11. | Zeros | 87 |
| 12. | Asymptotic formula | 87 |
| 13. | Orthogonal functions arising from linear boundary value problems | 88 |
| IV. | Boundary Value Problems | |
| 1. | Fourier series: Laplace's equation in an infinite strip | 91 |
| 2. | Fourier series: Laplace's equation in a rectangle | 95 |
| 3. | Fourier series: vibrating string | 96 |
| 4. | Fourier series: damped vibrating string | 100 |
| 5. | Polar coordinates in the plane | 101 |
| 6. | Fourier series: Laplace's equation in a circle; Poisson's integral | 103 |
| 7. | Transformation of Laplace's equation in three dimensions | 105 |
| 8. | Legendre series: Leplace's equation in a sphere | 107 |
| 9. | Bessel series: Laplace's equation in a cylinder | 109 |
| 10. | Bessel series: circular drumhead | 112 |
| V. | Double Series; Laplace Series | |
| 1. | Boundary value problem in a cube; double Fourier series | 115 |
| 2. | General spherical harmonics | 118 |
| 3. | Laplace series | 121 |
| 4. | Harmonic polynomials | 126 |
| 5. | Rotation of axes | 129 |
| 6. | Integral representation for group of terms in the Laplace series | 132 |
| 7. | Completeness of the Laplace series | 137 |
| 8. | Boundary value problem in a cylinder; series involving Bessel functions of positive order | 138 |
| VI. | The Pearson Frequency Functions | |
| 1. | The Pearson differential equation | 142 |
| 2. | Quadratic denominator, real roots | 142 |
| 3. | Quadratic denominator, complex roots | 145 |
| 4. | Linear or constant denominator | 146 |
| 5. | Finiteness of moments | 147 |
| VII. | Orthogonal Polynomials | |
| 1. | Weight function | 149 |
| 2. | Schmidt's process | 151 |
| 3. | Orthogonal polynomials corresponding to an arbitrary weight function | 153 |
| 4. | Development of an arbitrary function in series | 155 |
| 5. | Formula of recurrence | 156 |
| 6. | Christoffel-Darboux identity | 157 |
| 7. | Symmetry | 158 |
| 8. | Zeros | 159 |
| 9. | Least-square property | 160 |
| 10. | Differential equation | 161 |
| VIII. | Jacobi Polynomials | |
| 1. | Derivative definition | 166 |
| 2. | Orthogonality | 167 |
| 3. | Leading coefficients | 169 |
| 4. | Normalizing factor; series of Jacobi polynomials | 171 |
| 5. | Recurrence formula | 172 |
| 6. | Differential equation | 173 |
| IX. | Hermite Polynomials | |
| 1. | Derivative definition | 176 |
| 2. | Orthogonality and normalizing factor | 177 |
| 3. | Hermite and Gram-Charlier series | 178 |
| 4. | Recurrence formulas; differential equation | 179 |
| 5. | Generating function | 181 |
| 6. | Wave equation of the linear oscillator | 181 |
| X. | Laguerre Polynomials | |
| 1. | Derivative definition | 184 |
| 2. | Orthogonality; normalizing factor; Laguerre series | 184 |
| 3. | Differential equation and recurrence formulas | 186 |
| 4. | Generating function | 187 |
| 5. | Wave equation of the hydrogen atom | 188 |
| XI. | Convergence | |
| 1. | Scope of the discussion | 191 |
| 2. | Magnitude of the coefficients; first hypothesis | 192 |
| 3. | Convergence; first hypothesis | 194 |
| 4. | Magnitude of the coefficients; second hypothesis | 197 |
| 5. | Convergence; second hypothesis | 199 |
| 6. | Special Jacobi polynomials | 200 |
| 7. | Multiplication or division of the weight function by a polynomial | 201 |
| 8. | Korous's theorem on bounds of orthonormal polynomials | 205 |
| Exercises | 209 | |
| Bibliography | 229 | |
| Index | 231 |
Overview