We are interested in the nonlinear, time-harmonic Maxwell equation $$\nabla\times
(\nabla\times\mathbf {E})+ V (x)\mathbf {E}= h (x,\mathbf {E})\mbox {in}\mathbb {R}^ 3$$ with …

We show a linking-type result which allows us to study strongly indefinite problems with sign-
changing nonlinearities. We apply the abstract theory to the singular Schrödinger equation …

We are interested in a general Choquard equation− Δ+ m 2 u− m u+ V (x) u− μ| x| u=∫ RNF
(y, u (y))| x− y| N− α dyf (x, u)− K (x)| u| q− 2 u under suitable assumptions on the bounded …

We show an abstract critical point theorem about existence of infinitely many critical orbits to
strongly indefinite functionals with sign-changing nonlinear part defined on a dislocation …

We are interested in the following Dirichlet problem:-Δ u+ λ u-μ u| x| 2-ν u dist (x, RN\Ω) 2= f
(x, u) in Ω u= 0 on∂ Ω, on a bounded domain Ω⊂ RN with 0∈ Ω. We assume that the …