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Article
Zu axialsymmetrischen stationären Lösungen der Einsteinschen Feldgleichungen für das Vakuum
For axialsymmetric stationary vacuum fields Einstein equations reduce to a system, derivable from a simple Lagrangian. An investigation of its forminvariance leads to a method to construct from known solutions...
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Algebraisch spezielle Einstein-Räume mit einer Bewegungsgruppe
In algebraically special Einstein spaces (Rμv=0) with a hypersurfaceorthogonal spacelike Killing vector field ξv, the trajectories of the multiple eigen null directions kμ lie — except one case — in the subspaces