Titlebook: Geometric Aspects of the Einstein Equations and Integrable Systems; Proceedings of the S R. Martini Conference proceedings 1985 Springer-Ve

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https://doi.org/10.1007/978-3-030-55728-7on system with a matrix real semi-simple Lie algebra g possesses its own geometry of n-dim. submanifolds of g. Various applications of this approach are discussed. A particular attention is paid to integrable classical string models.

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Superposition of solutions in general relativity, and an approximate solution is a new exact solution. Superposition theorems are obtained for the vacuum Einstein equations with and without cosmological constant, the coupled Einstein-Maxwell equations, and the Einstein equations for a perfect fluid.

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Surviving on the Margins of Society in China and an approximate solution is a new exact solution. Superposition theorems are obtained for the vacuum Einstein equations with and without cosmological constant, the coupled Einstein-Maxwell equations, and the Einstein equations for a perfect fluid.

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https://doi.org/10.1007/978-3-030-55728-7on system with a matrix real semi-simple Lie algebra g possesses its own geometry of n-dim. submanifolds of g. Various applications of this approach are discussed. A particular attention is paid to integrable classical string models.

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