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Some nonlinear problems for the superposition of fractional operators with Neumann boundary conditions

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  • Serena Dipierro
  • Edoardo Proietti Lippi
  • Caterina Sportelli
  • Enrico Valdinoci

Abstract

We discuss the existence theory of a nonlinear problem of nonlocal type subject to Neumann boundary conditions. Differently from the existing literature, the elliptic operator under consideration is obtained as a superposition of operators of mixed order. The setting that we introduce is very general and comprises, for instance, the sum of two fractional Laplacians, or of a fractional Laplacian and a Laplacian, as particular cases (the situation in which there are infinitely many operators, and even a continuous distribution of operators, can be considered as well). New bits of functional analysis are introduced to deal with this problem. An eigenvalue analysis divides the existence theory into two streams, one related to a mountain pass method, the other to a linking technique.

Suggested Citation

  • Serena Dipierro & Edoardo Proietti Lippi & Caterina Sportelli & Enrico Valdinoci, 2025. "Some nonlinear problems for the superposition of fractional operators with Neumann boundary conditions," Mathematische Nachrichten, Wiley Blackwell, vol. 298(8), pages 2570-2595, August.
    • Handle: RePEc:bla:mathna:v:298:y:2025:i:8:p:2570-2595
    DOI: 10.1002/mana.70006
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