An infinite-dimensional linking theorem without upper semi-continuous assumption and its applications

Ground state solutions for some indefinite variational problems

Andrzej Szulkin, Tobias Weth · Journal of Functional Analysis · 2009 · 479 citations

Natural Sciences, Mathematics, Differential Equations +4

Generalized linking theorem with an application to a semilinear Schrödinger equation

Wojciech Kryszewski, Andrzej Szulkin · Advances in Differential Equations · 1998 · 318 citations · Full text

Natural Sciences, Mathematics, Physics +7

AN ASYMPTOTICALLY PERIODIC SCHRÖDINGER EQUATION WITH INDEFINITE LINEAR PART

Gongbao Li, Andrzej Szulkin · Communications in Contemporary Mathematics · 2002 · 174 citations

Natural Sciences, Mathematics, Physics +9

Homoclinic Orbits for Asymptotically Linear Hamiltonian Systems

Andrzej Szulkin, Wenming Zou · Journal of Functional Analysis · 2001 · 157 citations

Natural Sciences, Mathematics, Complex Systems +13

Variational methods for strongly indefinite problems

Ding Yanheng · Scientia Sinica Mathematica · 2017 · 145 citations · Full text

Natural Sciences, Computer Science, Mathematics +10