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Research Article | Open | Published:

Quasi-concavity for semilinear elliptic equations with non-monotone and anisotropic nonlinearities

Boundary Value Problemsvolume 2006, Article number: 80347 (2006) | Download Citation

Abstract

A boundary-value problem for a semilinear elliptic equation in a convex ring is considered. Under suitable structural conditions, any classical solution lying between its (constant) boundary values is shown to decrease along each ray starting from the origin, and to have convex level surfaces.

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  1. Dipartimento di Matematica e Informatica, via Ospedale 72, Cagliari, 09124, Italy

    • Antonio Greco

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Correspondence to Antonio Greco.

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Keywords

  • Differential Equation
  • Partial Differential Equation
  • Ordinary Differential Equation
  • Functional Equation
  • Structural Condition