　　THE first edition of this book appeared more than thirty years ago. in the course of reissues over these decades the book has been revised and expanded; its volume has almost doubled since the first edition. But at no time has there been any need to change the method proposed by Landau for developing the theory， or his style of presentation， whose main feature was a striving for clarity and simplicity. I have made every effort to preserve this style in the revisions that I have had to make on my own.
　　As compared with the preceding edition， the first nine chapters， devoted to electrodynamics， have remained almost without changes. The chapters concerning the theory of the gravitational field have been revised and expanded. The material in this. e chapters has increased from edition to edition， and it was finally necessary to redistribute and rearrange it.
　　本书为英文版。

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EXCERPTS FROM THE PREFACES TO THE FIRST AND SECOND EDITIONS.
PREFACE TO THE FOURTH ENGLISH EDITION
EDITOR‘S PREFACE TO THE SEVENTH RUSSIAN EDITION
NOTATION
CHAPTER I. THE PRINCIPLE OF RELATIVITY
1 Velocity of propagation of interaction
2 Intervals
3 Proper time
4 The Lorentz transformation
5 Transformation of velocities
6 Four-vectors
7 Four-dimensional velocity
CHAPTER 2. RELATIVISTIC MECHANICS
8 The principle of least action
9 Energy and momentum
10 Transformation of distribution functions
11 Decay of particles
12 Invariant cross-section
13 Elastic collisions of particles
14 Angular momentum
CHAPTER 3.CHARGES IN ELECTROMAGNETIC FIELDS
15 Elementary particles in the theory of relativity
16 Four-potential of a field
17 Equations of motion of a charge in a field
18 Gauge invariance
19 Constant electromagnetic field
20 Motion in a constatn uniform electric field
21 Motion in a constatn uniform magnetic field
22 Motion of a charge in constant uniform electric and magnctic fields
23 Lorentz transformation of the field
24 Invariants of the field
CHPATER 4.THE ELECTROMAGNETIC FIELD EQUATIONS
26 The first pair of maxwells equations
27 The action function of the electromagnetic field
28 The four-dimensional current vector
29 The equation of continuity
30 The second pair of Maxwell Equstions
31 Energy density and energy flux
32 The energy-momentum tensor
33 Energy-momentum tensor of the electromagnetic field
34 The virial theorem
35 The energy-momentum tensor for macroscopic bodies
CHAPTER 5.CONSTANT ELECTORMANETIC FIELDS
CHAPTER 6.ELECTOPRMAGNETIC WAVES
CHAPTER 7.THE PROPAGATION OF LIGHT
CHAPTER 8.THE FIELD OF MOVING CHARGES
CHAPTER 9.RADIATION OF ELECTROMAGNETIC WAVES
CHAPTER 10.PARTICLE IN A GRAVITATIONAL FIELD
CHAPTER 11.THE GRAVITATIONAL FIELD EQUATIONS
CHAPTER 12.THE FIELD OF GRAVITAING BODIES
CHAPTER 13.GRAVITATIONAL WAVES
CAHPTER 14.RELATIVISTIC COSMOLOGY
INDEX