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math.MG2005
A note on common zeroes of Laplace--Beltrami eigenfunctions
V. M. Gichev
Let $\De u+\la u=\De v+\la v=0$, where $\De$ is the Laplace--Beltrami operator on a compact connected smooth manifold and $\la>0$. If then there exists such…
math.MG2005
On Geometry of Flat Complete Strictly Causal Lorentzian Manifolds
V. M. Gichev, E. A. Meshcheryakov
A flat complete causal Lorentzian manifold is called {\it strictly causal} if the past and the future of each its point are closed near this point. We consider strictly causal mani…
math.MG2005★ 2 cited
On flat complete causal Lorentzian manifolds
V. M. Gichev, O. S. Morozov
We describe up to finite coverings causal flat affine complete Lorentzian manifolds such that the past and the future of any point are closed near this point. We say that these man…