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math.DG2006
Compact Lorentz manifolds with local symmetry
Karin Melnick
We prove a structure theorem for compact aspherical Lorentz manifolds with abundant local symmetry. If M is a compact, aspherical, real-analytic, complete Lorentz manifold such tha…
math.DS2006
Actions of noncompact semisimple groups on Lorentz manifolds
Mohamed Deffaf, Karin Melnick, Abdelghani Zeghib
The above title is the same, but with "semisimple" instead of "simple," as that of a notice by N. Kowalsky. There, she announced many theorems on the subject of actions of simple L…