Princeton: Princeton University Press, 1953. First separate edition of Einstein's attempt to reconcile his own gravitational equations with Maxwell's electromagnetic equations, building toward a unified "field" theory of energy. Octavo, original wrappers. In fine condition. Exceptionally rare. General relativity is the geometric theory of gravitation published by Albert Einstein in 1915 and the current description of gravitation in modern physics. General relativity has been described as the most beautiful of all existing physical theories. General relativity generalizes special relativity and Newton's law of universal gravitation, providing a unified description of gravity as a geometric property of space and time, or spacetime. In particular, the curvature of spacetime is directly related to the energy and momentum of whatever matter and radiation are present. The relation is specified by the Einstein field equations, a system of partial differential equations. (Inventory #: 69029)
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