Remarks on sublinear elliptic equations
Non-Linear Analysis
Time-mappings and multiplicity of solutions for the one-dimensional p-Laplacian
Nonlinear Analysis: Theory, Methods & Applications
Instability of nonnegative solutions for a class of semilinear
Journal of Computational and Applied Mathematics - Special issue: positive solutions of nonlinear problems
Positive solutions for a concave semipositone Dirichlet problem
Nonlinear Analysis: Theory, Methods & Applications
Journal of Computational and Applied Mathematics
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The exact number of positive solutions of a degenerate quasilinear two-point boundary value problem is investigated. For the generalization of earlier results concerning the nondegenerate case with convex nonlinearity, suitably defined p-convex nonlinearities are considered. Strictly p-convex C2 functions having a non-negative root are classified according to the shape of the bifurcation diagram of positive solutions versus the length of the interval. We have uniqueness when f(0) ≤ 0 and 0, 1 or 2 solutions when f(0) 0 (similarly to the non-degenerate case), provided that the number of solutions is finite. However, now there may also occur a continuum of solutions, connected to a dead core type phenomenon. The proof of our results relies on the shooting method for the characterization of the shape of the time-map. In contrast to the non-degenerate case, the shooting method does not determine directly the number of solutions, owing to the lack of uniqueness of the corresponding IVP. Exact conditions on the uniqueness of the IVP and, in the case of non-uniqueness, the number and types of its local solutions are given. Based on this, all the positive solutions of the BVP can be compiled.