Contents:

- Pablo Amster;
*A third look at the first result of Landesman-Lazer type*, Special Issue 01 (2021), pp. 1-11. - Jaime Arango;
*Oscillation time and damping coefficients in a nonlinear pendulum*, Special Issue 01 (2021), pp. 13-21. - Falko Baustian, Peter Takac;
*Space-time analyticity of weak solutions to semilinear parabolic systems with variable coefficients*, Special Issue 01 (2021), pp. 23-89. - Jose F. Caicedo, Alfonso Castro, Rodrigo Duque;
*A semilinear wave equation with non-monotone nonlinearity and forcing flat on characteristics*, Special Issue 01 (2021), pp. 91-99. - Alfonso Castro, Jorge Cossio, Sigifredo Herron, Carlos Velez;
*Infinitely many radial solutions for a p-Laplacian problem with negative weight at the origin*, Special Issue 01 (2021), pp. 101-114. - Yutong Chen, Jiabao Su, Mingzheng Sun, Rushun Tian;
*An elliptic equation involving the square root of the Laplacian without asymptotic limits*, Special Issue 01 (2021), pp. 105-124. - Eylem Ozturk, Julio D. Rossi;
*Limit for the p-laplacian equation with dynamical boundary conditions*, Special Issue 01 (2021), pp. 135-147. - Filomena Pacella, David Stolnicki;
*Oscillatory solutions and critical exponents for fully nonlinear equations*, Special Issue 01 (2021), pp. 149-167. - Florin-Iulian Onete, Nikolaos S. Papageorgiou, Vicentiu D. Radulescu;
*Twin positive solutions for resonant singular (p,q)-equations*, Special Issue 01 (2021), pp. 169-182. - Leandro L. Recova, Adolfo J. Rumbos;
*An asymmetric problem at resonance with a one-sided Ahmad-Lazer-Paul condition*, Special Issue 01 (2021), pp. 183-202. - Luis Sanchez, Joao G. Silva;
*Remarks on periodic resonant problems with nonlinear dissipation*, Special Issue 01 (2021), pp. 203-212. - Martin Schechter;
*Infinite dimensional extensions of the Landesman-Lazer theorem*, Special Issue 01 (2021), pp. 213-224. - Jiaxuan Yang, Yongqing Li, Zhi-Qiang Wang;
*Radial and non-radial solutions for a nonlinear Schrodinger equation with a constraint*, Special Issue 01 (2021), pp. 225-237. - Ruyun Ma, Zhongzi Zhao, Dongliang Yan;
*Connected components of positive solutions of biharmonic equations with the clamped plate conditions in two dimensions*, Special Issue 01 (2021), pp. 239-253. - Marta Calanchi, Bernhard Ruf;
*Eigenvalues and bifurcation for Neumann problems with indefinite weights*, Special Issue 01 (2021), pp. 255-268. - Jean Mawhin;
*The mean value property and zeros of holomorphic functions (Gauss, Poisson, Bolzano, and Cauchy meet in the complex plane)*, Special Issue 01 (2021), pp. 269-278. - Maya Chhetri, Nsoki Mavinga, Rosa Pardo;
*Bifurcation from infinity with oscillatory nonlinearity for Neumann problems*, Special Issue 01 (2021), pp. 279-292. - Ananta Acharya, Ujjal Das, Ratnasingham Shivaji;
*Existence and multiplicity results for p-q-Laplacian boundary value problems*, Special Issue 01 (2021), pp. 293-300. - Philip Korman, Dieter S. Schmidt;
*Infinitely many solutions and asymptotics for resonant oscillatory problems*, Special Issue 01 (2021), pp. 301-314. - Helmut Knolle, Jairo Santanilla;
*SIR epidemic models with spatial spread in bounded domains*, Special Issue 01 (2021), pp. 315-325.

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