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1. Superlinear perturbations of the eigenvalue problem for the Robin Laplacian plus an indefinite and unbounded potential
Nikolaos Papageorgiou, Vicenţiu Rǎdulescu, Dušan Repovš, 2020, original scientific article

Keywords: superlinear perturbation, regularity theory, maximum principle, constant sign and nodal solutions, critical groups, indefinite potential
Full text (file, 661,09 KB)

2. Nonlinear, nonhomogeneous Robin problems with indefinite potential and general reaction
Nikolaos Papageorgiou, Vicenţiu Rǎdulescu, Dušan Repovš, 2020, original scientific article

Keywords: nonhomogeneous differential operator, nonlinear regularity theory, constant sign and nodal solutions, infinitely many nodal solutions, critical groups
Full text (file, 397,82 KB)

3. Nonlinear Dirichlet problems with unilateral growth on the reaction
Nikolaos Papageorgiou, Vicenţiu Rǎdulescu, Dušan Repovš, 2019, original scientific article

Keywords: unilateral growth, constant sign and nodal solutions, multiplicity theorems, critical groups
Full text (file, 656,87 KB)

4. (p,2)-equations asymmetric at both zero and infinity
Nikolaos Papageorgiou, Vicenţiu Rǎdulescu, Dušan Repovš, 2018, original scientific article

Keywords: asymmetric reaction, resonance, Fučik spectrum, constant sign solutions, nodal solution, critical groups, Morse relation
Full text (file, 684,43 KB)

5. On a class of parametric (p, 2)-equations
Nikolaos Papageorgiou, Vicenţiu Rǎdulescu, Dušan Repovš, 2017, original scientific article

Keywords: near resonance, local minimizer, critical group, constant sign and nodal solutions, nonlinear maximum principle
Full text (file, 711,21 KB)

6. Nonhomogeneous hemivariational inequalities with indefinite potential and Robin boundary condition
Nikolaos Papageorgiou, Vicenţiu Rǎdulescu, Dušan Repovš, 2017, original scientific article

Keywords: locally Lipschitz function, Clarke subdifferential, resonance, extremal constant sign solutions, nodal solutions, nonlinear nonhomogeneous differential operator
Full text (file, 514,03 KB)
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