Generalized Fountain Theorem and applications to strongly indefinite semilinear problems

A Relation Between Pointwise Convergence of Functions and Convergence of Functionals

Élliott H. Lieb · Proceedings of the American Mathematical Society · 1983 · 1.2K citations

Functional Analysis

Ground state solutions for some indefinite variational problems

Andrzej Szulkin, Tobias Weth · Journal of Functional Analysis · 2009 · 457 citations

Calculus Of Variation, Ground State Solutions, Variational Analysis

Generalized linking theorem with an application to a semilinear Schrödinger equation

Wojciech Kryszewski, Andrzej Szulkin · Advances in Differential Equations · 1998 · 316 citations · Full text

Spectral Theory, Elliptic Equation, Engineering +9

On critical point theory for indefinite functionals in the presence of symmetries

Vieri Benci · Transactions of the American Mathematical Society · 1982 · 291 citations · Full text

Hamiltonian Theory, Symmetric Function, Hamiltonian Systems +10

Periodic Nonlinear Schrödinger Equation with Application to Photonic Crystals

Milan Journal of Mathematics · 2005 · 279 citations

Photonics, Engineering, Physics +5