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Einstein
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In 1908, Einstein was appointed Privadozent in Berne. The next year, he became Professor Extraordinary in Zurich, and in 1911 Professor of Theoretical Physics at Prague, returning to Zurich in 1912 to fill a similar post. In 1914, he was appointed Director of the Kaiser Wilhelm Physical Institute and Professor in the University of Berlin. He became a German citizen in 1914 and remained in Berlin until 1933, when he renounced his citizenship for political reasons and emigrated to America to take the position of Professor of Theoretical Physics at Princeton. He became a U.S. citizen in 1940 and retired from his post in 1945.
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Einstein was born in Ulm on March 14, 1879, and spent his youth in Munich, where his family owned a small shop that manufactured electric machinery. He did not talk until the age of three, but even as a youth he showed a brilliant curiosity about nature and an ability to understand difficult mathematical concepts. At the age of 12 he taught himself Euclidean geometry.
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Einstein assumed a structure of a four-dimensional space-time continuum expressed in axioms represented by five component vectors. Particles appear in his research as a limited region in space in which the field strength or the energy density are particularly high. Einstein treated subatomic particles in this research as objects embedded in the unified field, influencing it and existing as an essential constituent of the unified field but not of it. Einstein ... investigated a natural generalization of symmetrical tensor fields, treating the combination of two parts of the field as being a natural procedure of the total field and not the symmetrical and antisymmetrical parts separately. He researched a way to delineate the equations to be derived from a variational principle.
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The next question is why separability is viewed by Einstein as virtually an a priori necessary condition for the possibility of a science of physics. One reason is because a field theory like general relativity, which was Einstein's model for a future unified foundation for physics, is an extreme embodiment of the principle of separability: "Field theory has carried out this principle to the extreme, in that it localizes within infinitely small (four-dimensional) space-elements the elementary things existing independently of the one another that it takes as basic, as well as the elementary laws it postulates for them" (Einstein 1948, 321-322). And a field theory like general relativity can do this because the infinitesimal metric interval -- the careful way to think about separation in general relativistic spacetime -- is invariant (hence univocally determined) under all continuous coordinate transformations.
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Einstein suffered from dyslexia. He is a clear example of a person who would be labeled as learning disabled in today's educational system. With the right approach to education, these labels cannot prevent great accomplishments, as proven by Einstein and others.
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On October 1, 1940 Einstein swore the oath on the American constitution and ... became an American citizen. Now he was a a Swiss and an American citizen and stayed it until his death on April 18, 1955.
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