tailieunhanh - THE FIRST EIGENVALUE OF p-LAPLACIAN SYSTEMS WITH NONLINEAR BOUNDARY CONDITIONS D. A. KANDILAKIS, M.

THE FIRST EIGENVALUE OF p-LAPLACIAN SYSTEMS WITH NONLINEAR BOUNDARY CONDITIONS D. A. KANDILAKIS, M. MAGIROPOULOS, AND N. B. ZOGRAPHOPOULOS Received 12 October 2004 and in revised form 21 January 2005 We study the properties of the positive principal eigenvalue and the corresponding eigenspaces of two quasilinear elliptic systems under nonlinear boundary conditions. We prove that this eigenvalue is simple, unique up to positive eigenfunctions for both systems, and isolated for one of them. 1. Introduction Let Ω be an unbounded domain in RN , N ≥ 2, with a noncompact and smooth boundary ∂Ω. In this paper we prove certain properties of. | THE FIRST EIGENVALUE OF p-LAPLACIAN SYSTEMS WITH NONLINEAR BOUNDARY CONDITIONS D. A. KANDILAKIS M. MAGIROPOULOS AND N. B. ZOGRAPHOPOULOS Received 12 October 2004 and in revised form 21 January 2005 We study the properties of the positive principal eigenvalue and the corresponding eigenspaces of two quasilinear elliptic systems under nonlinear boundary conditions. We prove that this eigenvalue is simple unique up to positive eigenfunctions for both systems and isolated for one of them. 1. Introduction Let D be an unbounded domain in RN N 2 with a noncompact and smooth boundary dD. In this paper we prove certain properties of the principal eigenvalue of the following quasilinear elliptic systems -ApU Ằa x u p 2U Ằb x u a 1 v f 1u in D -Aqv Ằd x v q-2v Ab x u a 1 v f-1v in D -ApU Ằa x u p 2U Ằb x u a v fv in D -Aqv Ảd x v q-2v Ảb x u a v fu in D satisfying the nonlinear boundary conditions Vu p 2Vu n c1 x u p 2U 0 on dD Vv q-2Vv n c2 x v q-2v 0 on dD where n is the unit outward normal vector on dD. As it will be clear later under condition H1 1 p q N a f 0 and a 1 f 1 pq n p q p q 1 a 1 N f 1 N systems are in fact nonlinear eigenvalue problems. Our procedure here will be based on the proper space setting provided in 14 see Section 2 . In this section we also state the assumptions on the coefficient functions. Copyright 2006 Hindawi Publishing Corporation Boundary Value Problems 2005 3 2005 307-321 DOI 308 The first eigenvalue of p-Laplacian systems Problems of such a type arise in a variety of applications for example non-Newtonian fluids reaction-diffusion problems theory of superconductors biology and so forth see 2 15 and the references therein . As a consequence there are many works treating nonlinear systems from different points of view for example 4 7 9 11 13 . Properties of the principal eigenvalue are of prime interest since for example they are closely associated with the dynamics of the associated evolution .

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