A general existence proof for non-linear elliptic equations in semi-Riemannian spaces

Details A general existence proof for non-linear elliptic equations in semi-Riemannian spaces A general existence proof for non-linear elliptic equations in semi-Riemannian spaces

2007-09-20

arxiv.org/abs/0709.3123v3

Mathematics

Differential Geometry

18 pages, v3: minor corrections, final version, to appear in Am. J. Math

Scientific paper

We present a general existence proof for a wide class of non-linear elliptic equations which can be applied to problems with barrier conditions without specifying any assumptions guaranteeing the uniqueness or local uniqueness of particular solutions. As an application we prove the existence of closed hypersurfaces with curvature prescribed in the tangent bundle of an ambient Riemannian manifold $N$ without supposing any sign condition on the sectional curvatures $K_N$. A curvature flow wouldn't work in this situation, neither the method of successive approximation.

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