@article{Squassina_Van Schaftingen_2012, title={Finding critical points whose polarization is also a critical point}, volume={40}, url={https://apcz.umk.pl/TMNA/article/view/TMNA.2012.037}, abstractNote={We show that near any given minimizing sequence of paths for the mountain pass lemma, there exists a critical point whose polarization is also a critical point. This is motivated by the fact that if any polarization of a critical point is also a critical point and the Euler-Lagrange equation is a second-order semi-linear elliptic problem, T. Bartsch, T. Weth and M. Willem (J. Anal. Math., 2005) have proved that the critical point is axially symmetric.}, number={2}, journal={Topological Methods in Nonlinear Analysis}, author={Squassina, Marco and Van Schaftingen, Jean}, year={2012}, month={Apr.}, pages={371–379} }