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nlin.SI2011★ 7 cited
On discrete integrable equations with convex variational principles
Alexander I. Bobenko, Felix Günther
We investigate the variational structure of discrete Laplace-type equations that are motivated by discrete integrable quad-equations. In particular, we explain why the reality cond…
math.DG2011
Isometry groups of Lorentzian manifolds of finite volume and The local geometry of compact homogeneous Lorentz spaces
Felix Günther
Based on the work of Adams and Stuck as well as on the work of Zeghib, we classify the Lie groups which can act isometrically and locally effectively on Lorentzian manifolds of fin…