Nonlinear nonhomogeneous singular problems

NS Papageorgiou, VD Rădulescu… - Calculus of Variations and …, 2020 - Springer
We consider a nonlinear Dirichlet problem driven by a nonhomogeneous differential
operator with a growth of order (p-1)(p-1) near+ ∞+∞ and with a reaction which has the …

Anisotropic equations with indefinite potential and competing nonlinearities

NS Papageorgiou, VD Rădulescu, DD Repovš - Nonlinear Analysis, 2020 - Elsevier
We consider a nonlinear Dirichlet problem driven by a variable exponent p-Laplacian plus
an indefinite potential term. The reaction has the competing effects of a parametric concave …

[HTML][HTML] Nonlinear eigenvalue problems for the (p, q)–Laplacian

NS Papageorgiou, D Qin, VD Rădulescu - Bulletin des Sciences …, 2021 - Elsevier
We consider a parametric (p, q)-equations with sign-changing reaction and Robin boundary
condition. We show that for all values of the parameter λ bigger than a certain value which …

Positive Solutions for Singular Anisotropic (pq)-Equations

NS Papageorgiou, P Winkert - The Journal of Geometric Analysis, 2021 - Springer
In this paper, we consider a Dirichlet problem driven by an anisotropic (p, q)-differential
operator and a parametric reaction having the competing effects of a singular term and of a …

Positive solutions for (p, q)-equations with convection and a sign-changing reaction

S Zeng, NS Papageorgiou - Advances in Nonlinear Analysis, 2021 - degruyter.com
We consider a nonlinear Dirichlet problem driven by the (p, q)-Laplacian and with a reaction
which is dependent on the gradient. We look for positive solutions and we do not assume …

On a class of critical Robin problems

S Leonardi, NS Papageorgiou - Forum Mathematicum, 2020 - degruyter.com
We consider a nonlinear parametric Robin problem. In the reaction, there are two terms, one
critical and the other locally defined. Using cut-off techniques, together with variational tools …

Partial Differential Equations-Nonlinear Robin problems with general potential and crossing reaction.

NS Papageorgiou, A Scapellato - Rendiconti Lincei-Matematica e …, 2019 - go.gale.com
We consider a nonlinear Robin problem driven by the p-Laplacian plus and indefinite
potential. The reaction is parametric and exhibits an asymmetric behavior as x [right arrow][+ …

Constant sign and nodal solutions for superlinear (p, q)–equations with indefinite potential and a concave boundary term

NS Papageorgiou, Y Zhang - Advances in Nonlinear Analysis, 2020 - degruyter.com
We consider a nonlinear elliptic equation driven by the (p, q)–Laplacian plus an indefinite
potential. The reaction is (p− 1)–superlinear and the boundary term is parametric and …

Anisotropic double-phase problems with indefinite potential: multiplicity of solutions

NS Papageorgiou, D Qin, VD Rădulescu - Analysis and Mathematical …, 2020 - Springer
We consider an anisotropic double-phase problem plus an indefinite potential. The reaction
is superlinear. Using variational tools together with truncation, perturbation and comparison …

Positive solutions for a class of nonlinear parametric Robin problems

L Gasiński, NS Papageorgiou, Y Zhang - Rendiconti del Circolo …, 2024 - Springer
We consider a nonlinear Robin problem driven by the p-Laplacian and a parametric
concave-convex reaction with the parameter multiplying the convex (superlinear) term. We …