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" "He understood that the sources of the gravitational field were not just ponderable matter but also field energy. He realized that gravitational field energy is to be included as a source and that the gravitational field equations were therefore bound to be nonlinear.
Abraham Pais (May 19, 1918 – July 28, 2000) was a Dutch-born American physicist and science historian. He served as an assistant to Niels Bohr in Denmark and was later a colleague of Albert Einstein at the Princeton Institute for Advanced Study. Pais wrote books documenting the lives of these two great physicists and the contributions they and others made to modern physics.
Biography information from Wikiquote
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