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Anisotropic Robin problems with indefinite potential
Electronic Research Archive 2025, 33(11): 6844-6864
Published: 17 November 2025
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We considered a nonlinear elliptic boundary value problem driven by the variable (anisotropic) ( p , q )-Laplacian with Robin boundary condition and a superlinear reaction which does not satisfy the Ambrosetti-Rabinowitz condition. Using critical point theory, truncation and comparison techniques and critical groups, we showed the existence of five nontrivial smooth solutions all with sign information and ordered.

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