Some nonlinear problems for the superposition of fractional operators with Neumann boundary conditions - Dipierro, Serena; Proietti Lippi, Edoardo; Sportelli, Caterina; Valdinoci, Enrico (Mathematische Nachrichten, 2025)
Keywords: Boundary conditions; Eigenvalues; Functional analysis; Neumann boundary condition; nonlocal operator; Operators (mathematics); superposition of operators of mixed order; variational methods