Partial differential equations also have principles: Maximum and antimaximum / Jean Mawhin -- http://www.ams.org/conm/540/'>http://www.ams.org/conm/540/'>http://www.ams.org/conm/540/'>http://www.ams.org/conm/540/'>http://www.ams.org/conm/540/'>http://www.ams.org/conm/540/'>http://www.ams.org/conm/540/'>http://www.ams.org/conm/540/'>http://www.ams.org/conm/540/'>http://www.ams.org/conm/540/'>http://www.ams.org/conm/540/'>http://www.ams.org/conm/540/'>http://www.ams.org/conm/540/'>http://www.ams.org/conm/540/ http://dx.doi.org/10.1090/conm/540/10655 On the Fučík spectrum for equations with symmetries / Bernhard Ruf -- http://www.ams.org/conm/540/ http://dx.doi.org/10.1090/conm/540/10656 Variations on the $p$-Laplacian / Bernd Kawohl -- http://www.ams.org/conm/540/ http://dx.doi.org/10.1090/conm/540/10657 Extremal functions in Poincaré-Sobolev inequalities for functions of bounded variation / Vincent Bouchez and Jean Van Schaftingen -- http://www.ams.org/conm/540/ http://dx.doi.org/10.1090/conm/540/10658 An elementary proof of an inequality of Maz'ya involving $L1̂$ vector fields / Pierre Bousquet and Petru Mironescu -- http://www.ams.org/conm/540/ http://dx.doi.org/10.1090/conm/540/10659 Homoclinic type solutions for a class of differential equations with periodic coefficients / David G. Costa and Chengyue Li -- http://www.ams.org/conm/540/ http://dx.doi.org/10.1090/conm/540/10660 Quasilinear and singular systems: The cooperative case / Jacques Giacomoni, Jesús Hernández and Abdelkrim Moussaoui -- http://www.ams.org/conm/540/ http://dx.doi.org/10.1090/conm/540/10661 Manifolds of critical points in a quasilinear model for phase transitions / Pavel Drábek, Raúl F. Manásevich and Peter Takáč -- http://www.ams.org/conm/540/ http://dx.doi.org/10.1090/conm/540/10662 Weighted asymmetric problems for an indefinite elliptic operator / Liamidi Leadi and Humberto Ramos Quoirin -- http://www.ams.org/conm/540/ http://dx.doi.org/10.1090/conm/540/10663 Multiple non-trivial solutions of the Dirichlet problem for the prescribed mean curvature equation / Franco Obersnel and Pierpaolo Omari -- http://www.ams.org/conm/540/ http://dx.doi.org/10.1090/conm/540/10664 Limits as $p(x)\to \infty $ of $p(x)$-harmonic functions with non-homogeneous Neumann boundary conditions / Mayte Perez-Llanos and Julio D. Rossi -- http://www.ams.org/conm/540/ http://dx.doi.org/10.1090/conm/540/10665 Bifurcation and decay of solutions for a class of elliptic equations on $\mathbb {R}N̂$ / C. A. Stuart -- http://www.ams.org/conm/540/ http://dx.doi.org/10.1090/conm/540/10666 Existence of nodal solutions for some nonlinear elliptic problems / Sébastien de Valeriola and Michel Willem -- http://www.ams.org/conm/540/ http://dx.doi.org/10.1090/conm/540/10667 Admissible $Q$-curvatures under isometries for the conformal GJMS operators / Frédéric Robert -- http://www.ams.org/conm/540/ http://dx.doi.org/10.1090/conm/540/10668