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The general relativity is the base for any exact evolutionary theory of largescale structures. We calculate the universal 2+1-dimensional plane equations ofgravitational field in general relativity. Based on the equations, theevolutions of disk nebula are discussed. A system of nebula can form binarystars or single star for different conditions. While any simplified lineartheory forms only a single star system. It is proved that the nonlinearinteractions are very general, so the binary stars are also common.

Universal 2+1-Dimensional Plane Equations in General Relativity and Evolutions of Disk Nebula