|   | Preface by W. Pauli; Preface by A. Sommerfeld; Bibliography |
| Part I. The foundations of the special theory of relativity |
|   | 1. Historical background (Lorentz, Poincaré, Einstein) |
|   | 2. The postulate of relativity |
|   | 3. The postulate of the constancy of the velocity of light. Ritz's and related theories |
|   | 4. The relativity of simultaneity. Derivation of the Lorentz transformation from the two postulates. Axiomatic nature of the Lorentz transformation |
|   | 5. Lorentz contraction and time dilatation |
|   | 6. Einstein's addition theorem for velocities and its application to aberration and the drag coefficient. The Doppler effect |
| Part II. Mathematical Tools |
|   | 7. The four-dimensional space-time world (Minkowski) |
|   | 8. More general transformation groups |
|   | 9. Tensor calculus for affine transformations |
|   | 10. Geometrical meaning of the contravariant and covariant components of a vector |
|   | 11. "Surface" and "volume" tensors. Four-dimensional volumes |
|   | 12. Dual tensors |
|   | 13. Transition to Riemannian geometry |
|   | 14. Parallel displacement of a vector |
|   | 15. Geodesic lines |
|   | 16. Space curvature |
|   | 17. Riemannian coordinates and their applications |
|   | 18. The special cases of Euclidean geometry and of constant curvature |
|   | 19. The integral theorems of Gauss and Stokes in a four-dimensional Riemannian manifold |
|   | 20. Derivation of invariant differential operations, using geodesic components |
|   | 21. Affine tensors and free vectors |
|   | 22. Reality relations |
|   | 23. Infinitesimal coordinate transformations and variational theorems |
| Part III. Special theory of relativity. Further elaborations |
| A. Kinematics |
|   | 24. Four-dimensional representation of the Lorentz transformation |
|   | 25. The addition theorem for velocities |
|   | 26. Transformation law for acceleration. Hyperbolic motion |
| B. Electrodynamics |
|   | 27. Conservation of charge. Four-current density |
|   | 28. Covariance of the basic equations of electron theory |
|   | 29. Ponderomotive forces. Dynamics of the electron |
|   | 30. Momentum and energy of the electromagnetic field. Differential and integral forms of the conservation laws |
|   | 31. The invariant action principle of electrodynamics |
|   | 32. Applications to special cases |
|   |   | a. Integration of the equations for the pote |
|   |   | b. The field of a uniformly moving point charge |
|   |   | c. The field for hyperbolic motion |
|   |   | d. Invariance of the light phase. Reflection at a moving mirror. Radiation pressure |
|   |   | e. The radiation field of a moving dipole |
|   |   | f. Radiation reaction |
|   | 33. Minkowski's phenomenological electrodynamics of moving bodies |
|   | 34. Electron-theoretical derivations |
|   | 35. Energy-momentum tensor and ponderomotive force in phenomenological electrodynamics. Joule heat |
|   | 36. Applications of the theory |
|   |   | a. The experiments of Rowland, Röntgen, Eichenwald and Wilson |
|   |   | b. Resistance and induction in moving conductors |
|   |   | c. Propagation of light in moving media. The drag coefficient. Airy's experiment |
|   |   | d. Signal velocity and phase velocity in dispersive media |
| C. Mechanics and general dynamics |
|   | 37. Equation of motion. Momentum and kinetic energy |
|   | 38. Relativistic mechanics on a basis independent of electrodynamics |
|   | 39. Hamilton's principle in relativistic mechanics |
|   | 40. Generalized coordinates. Canonical form of the equations of motion |
|   | 41. The inertia of energy |
|   | 42. General dynamics |
|   | 43. Transformation of energy and momentum of a system in the presence of external forces |
|   | 44. Applications to special cases. Trouton and Noble's experiments |
|   | 45. Hydrodynamics and theory of elasticity |
| D. Thermodynamics and statistical mechanics |
|   | 46. Behaviour of the thermodynamical quantities under a Lorentz transformation |
|   | 47. The principle of least action |
|   | 48. The application of relativity to statistical mechanics |
|   | 49. Special cases |
|   |   | a. Black-body radiation in a moving cavity |
|   |   | b. The ideal gas |
| Part IV. General theory of relativity |
|   | 50. Historical review, up to Einstein's paper of 1916 |
|   | 51. General formulation of the principle of equivalence. Connection between gravitation and metric |
|   | 52. The postulate of the general covariance of the physical laws |
|   | 53. Simple deductions from the principle of equivalence |
|   |   | a. The equations of motion of a point-mass for small velocities and weak gravitational f |
|   |   | b. The red shift of spectral lines |
|   |   | c. Fermat's principle of least time in static gravitational fields |
|   | 54. Influence of the gravitational field on material phenomena |
|   | 55. The action principles for material processes in the presence of gravitational fields |
|   | 56. The field equations of gravitation |
|   | 57. Derivation of the gravitational equations from a variational principle |
|   | 58. Comparison with experiment |
|   |   | a. Newtonian theory as a first approximation |
|   |   | b. Rigorous solution for the gravitational field of a point-mass |
|   |   | c. Perihelion precession of Mercury and the bending of light rays |
|   | 59. Other special, rigorous, solutions for the statical case |
|   | 60. Einstein's general approximative solution and its applications |
|   | 61. The energy of the gravitational field |
|   | 62. Modifications of the field equations. Relativity of inertia and the space-bounded universe |
|   |   | a. The Mach principle |
|   |   | b. Remarks on the statistical equilibrium of the system of fixed stars. The lambda-term |
|   |   | c. The energy of the finite universe |
| Part V. Theories on the nature of charged elementary particles |
|   | 63. The electron and the special theory of relativity |
|   | 64. Mie's theory |
|   | 65. Weyl's theory |
|   |   | a. Pure infinitesimal geometry. Gauge invariance |
|   |   | b. Electromagnetic field and world metric |
|   |   | c. The tensor calculus in Weyl's geometry |
|   |   | d. Field equations and action principle. Physical deductions |
|   | 66. Einstein's theory |
|   | 67. General remarks on the present state of the problem of matter |
|     Supplementary notes; Author index; Subject index |