We investigate the local and global nature of the bifurcation diagrams which can occur for a semilinear elliptic boundary value problem with Neumann boundary conditions involving sign-changing coefficients. It is shown that closed loops of positive and negative solutions occur naturally for such problems and properties of these loops are investigated. © 2007 Elsevier Inc. All rights reserved.
|Number of pages||15|
|Journal||Journal of Differential Equations|
|Publication status||Published - 15 Aug 2007|