**RELATIVITY:
THE SPECIAL AND GENERAL THEORY**

### Written by A. Einstein (1879-1955)

### Translated by ROBERT W. LAWSON

### First published by Henry Holt and Company, New York (1920)

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**CONTENTS**

**Part I: The Special Theory of
Relativity**

**Physical Meaning of Geometrical Propositions****The System of Co-ordinates****Space and Time in Classical Mechanics****The Galileian System of Co-ordinates****The Principle of Relativity (In the Restricted Sense)****The Theorem of the Addition of Velocities Employed in Classical Mechanics****The Apparent Incompatibility of the Law of Propagation of Light with the Principle of Relativity****On the Idea of Time in Physics****The Relativity of Simultaneity****On the Relativity of the Conception of Distance****The Lorentz Transformation****The Behaviour of Measuring-Rods and Clocks in Motion****Theorem of the Addition of Velocities. The Experiment of Fizeau****The Heuristic Value of the Theory of Relativity****General Results of the Theory****Experience and the Special Theory of Relativity****Minkowski’s Four-Dimensional Space**

**Part II: The General Theory of
Relativity**

**Special and General Principle of Relativity****The Gravitational Field****The Equality of Inertial and Gravitational Mass as an Argument for the General Postulate of Relativity****In What Respects Are the Foundations of Classical Mechanics and of the Special Theory of Relativity Unsatisfactory?****A Few Inferences from the General Theory of Relativity****Behaviour of Clocks and Measuring Rods on a Rotating Body of Reference****Euclidean and Non-Euclidean Continuum****Gaussian Co-ordinates****The Space-Time Continuum of the Special Theory of Relativity Considered as a Euclidean Continuum****The Space-Time Continuum of the General Theory of Relativity Is not a Euclidean Continuum****Exact Formulation of the General Principle of Relativity****The Solution of the Problem of Gravitation on the Basis of the General Principle of Relativity**

**Part III: Considerations on the
Universe as a Whole**

**Cosmological Difficulties of Newton’s Theory****The Possibility of a “Finite” and Yet “Unbounded” Universe****The Structure of Space According to the General Theory of Relativity**

**Appendices**

**Simple Derivation of the Lorentz Transformation****Minkowski’s Four-Dimensional Space (“World”)****The Experimental Confirmation of the General Theory of Relativity**

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I shall be commenting on this book one chapter at a time.