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Global Multiplicity of Positive Solutions for Nonlinear Robin Problems with an Indefinite Potential Term
We consider a Robin problem driven by a nonlinear nonhomogeneous differential operator plus an indefinite potential term. The reaction is parametric...
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Multiplicity Results for Nonlinear Nonhomogeneous Robin Problems with Indefinite Potential Term
We consider a nonlinear Robin problem driven by a general nonhomogeneous differential operator plus an indefinite potential term. The reaction is of...
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Umehara algebra and complex submanifolds of indefinite complex space forms
The Umehara algebra is studied with motivation on the problem of the non-existence of common complex submanifolds. In this paper, we prove some new...
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Arbitrarily Small Nodal Solutions for Parametric Robin (p, q)-Equations Plus an Indefinite Potential
We consider a nonlinear Robin problem driven by the ( p, q )-Laplacian plus an indefinite potential term and with a parametric reaction term. Under...
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Indefinite causal order with fixed temporal order for electrons and positrons
We provide an analysis of indefinite causal orders in relativistic quantum mechanics based on the electron–positron picture of Feynman involving...
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Indefinite Perturbations of the Eigenvalue Problem for the Nonautonomous p-Laplacian
We consider an indefinite perturbation of the eigenvalue problem for the nonautonomous p -Laplacian. The main result establishes an exhaustive...
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A variational setting for an indefinite Lagrangian with an affine Noether charge
We introduce a variational setting for the action functional of an autonomous and indefinite Lagrangian on a finite dimensional manifold M . Our basic...
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Extremal Regions and Multiplicity of Positive Solutions for Singular Superlinear Elliptic Systems with Indefinite-Sign Potential
In the present paper we deal with the existence, nonexistence and multiplicity of positive solutions for the singular superlinear and subcritical...
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Bounds on the Non-real Eigenvalues of Nonlocal Indefinite Sturm–Liouville Problems with Coupled Boundary Conditions
The present paper deals with non-real eigenvalues of nonlocal indefinite Sturm–Liouville problems involving nonlocal potential terms associated to...
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An efficient global algorithm for indefinite separable quadratic knapsack problems with box constraints
The indefinite separable quadratic knapsack problem (ISQKP) with box constraints is known to be NP-hard. In this paper, we propose a new...
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Ground States for DNLS Equation with Periodic or Asymptotically Periodic Potential
We study the existence of ground state solutions for a class of discrete nonlinear Schrödinger equation with a sign-changing potential which is...
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Generalized linking-type theorem with applications to strongly indefinite problems with sign-changing nonlinearities
We show a linking-type result which allows us to study strongly indefinite problems with sign-changing nonlinearities. We apply the abstract theory...
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Anisotropic double-phase problems with indefinite potential: multiplicity of solutions
We consider an anisotropic double-phase problem plus an indefinite potential. The reaction is superlinear. Using variational tools together with...