| Preface | |
| Acknowledgments | |
| Introduction | 3 |
| 1 | Gauge Transformations in Classical Electromagnetism | 13 |
| Gravitation and Electricity | 24 |
| 2 | Aftermath of Einstein's Gravitational Theory | 38 |
| 3 | Generalizations of Einstein's Theory | 44 |
| On the Unification Problem of Physics | 53 |
| Quantum Theory and Five-Dimensional Relativity | 59 |
| On the Invariant Form of the Wave and Motion Equations for a Charged Point-Mass | 70 |
| 4 | The Renaissance of Weyl's Idea: EM Gauge Theory | 77 |
| On a Remarkable Property of the Quantum-Orbits of a Single Electron | 87 |
| Quantization as an Eigenvalue Problem | 91 |
| Quantum-Mechanical Interpretation of Weyl's Theory | 94 |
| 5 | Weyl's Classic, 1929 | 107 |
| Electron and Gravitation | 121 |
| 6 | Klein's Serendipity, 1938 | 147 |
| On the Theory of Charged Fields | 152 |
| 7 | Pauli's Dimensional Reduction, 1953 | 166 |
| Meson-Nucleon Interaction and Differential Geometry | 171 |
| 8 | The Yang-Mills Theory, 1953-54 | 182 |
| Isotopic Spin Conservation and a Generalized Gauge Invariance | 185 |
| Conservation of Isotopic Spin and Isotopic Gauge Invariance | 186 |
| 9 | Shaw's SO(2) Approach, 1954-55 | 197 |
| Invariance under General Isotopic Spin Transformations | 200 |
| 10 | Utiyama's General Approach, 1954-55 | 208 |
| Invariant Theoretical Interpretation of Interaction | 213 |
| Conclusion | 240 |
| References | 243 |
| Index | 247 |