tailieunhanh - Báo cáo hóa học: " Research Article A Nonlinear Inequality Arising in Geometry and Calabi-Bernstein Type Problems"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article A Nonlinear Inequality Arising in Geometry and Calabi-Bernstein Type Problems | Hindawi Publishing Corporation Journal of Inequalities and Applications Volume 2010 Article ID 950380 10 pages doi 2010 950380 Research Article A Nonlinear Inequality Arising in Geometry and Calabi-Bernstein Type Problems Alfonso Romero1 and Rafael M. Rubio2 1 Departamento de Geometria y Topologia Universidad de Granada 18071 Granada Spain 2 Departamento de Matemdticas Campus de Rabanales Universidad de Cordoba 14071 Cordoba Spain Correspondence should be addressed to Rafael M. Rubio rmrubio@ Received 28 May 2010 Revised 19 August 2010 Accepted 18 September 2010 Academic Editor Martin Bohner Copyright 2010 A. Romero and R. M. Rubio. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. A characterization for the entire solutions of a nonlinear inequality which has a natural interpretation in terms of certain nonflat Robertson-Walker spacetimes is given. As an application new Calabi-Bernstein type problems are solved. 1. Introduction Let f I R be a positive smooth function on an open interval I a b -TO a b TO of the real line R and let Q be an open domain of R2. For each u CTO Q such that Du f u where Du stands for the length of the gradient Du of u we consider the smooth function H u - divf x Du _ i I f G 2 Du2 y 2f ụ ỵ f uý - Du 2 y 2ỵjf uý - Du 2 f w where div represents the divergence operator. The function H u has a natural geometric interpretation as showed below. In fact consider the graph u x y x y x y Q of u in the 3-dimensional manifold M I X R2 endowed with the Lorentzian metric c -nl di2 f XI 2n-R2 g0 2 Journal of Inequalities and Applications where nI and nR2 denote the projections onto I and R2 respectively and go is the usual Riemannian metric of R2. The Lorentzian manifold M is the warped product in the sense of 1 page 204 with base I -dt2 fiber R2 g0 and warping function f.

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