Abstract

HIDALGO, RUBÉN  and  GODOY, MAURICIO. EXISTENCE OF SOLUTIONS OF SEMILINEAR SYSTEMS IN . Proyecciones (Antofagasta) [online]. 2008, vol.27, n.2, pp.171-183. ISSN 0716-0917.  http://dx.doi.org/10.4067/S0716-09172008000200004.

Let Q : be a symmetric and positive semi-definite linear operator and f_j : (j = 1, 2, ...) be real functions so that, f_j(0) = 0 and, for every x = (x₁, x₂, ....) , it holds that f (x) := (f1(x₁), f2(x₂), ...) . Sufficient conditions for the existence of non-trivial solutions to the semilinear problem Q_x = f (x) are provided. Moreover, if G is a group of orthogonal linear automorphisms of which commute with Q, then such sufficient conditions ensure the existence of non-trivial solutions which are invariant under G. As a consequence, sufficient conditions to ensure solutions of nonlinear partial difference equations on finite degree graphs with vertex set being either finite or infinitely countable are obtained. We consider adaptations to graphs of both Matukuma type equations and Helmholtz equations and study the existence of their solutions.

Keywords : Graphs; Partial difference equations; Nonlinear elliptic equations; Laplacian.

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