Contents:

- Abraham Abebe, Maya Chhetri;
*A nonexistence result for p-Laplacian systems in a ball*, Special Issue 02 (2023), pp. 1-10. - Qinglan Bao, Guangsheng Wei, Anton Zettl;
*Friedrichs extension of singular symmetric differential operators*, Special Issue 02 (2023), pp. 11-39. - Horst Behncke, Don Hinton;
*Spectral theory of C-symmetric non-selfadjoint differential operators of order 2n*, Special Issue 02 (2023), pp. 41-66. - Jiri Benedikt, Jan Pulpan;
*Numeric estimates of the principal eigenvalue of the p-Laplacian using interval arithmetic*, Special Issue 02 (2023), pp. 67-80. - Jose F. Caicedo, Alfonso Castro, Arturo Sanjuan;
*A semilinear wave equation with non-monotone nonlinearity*, Special Issue 02 (2023), pp. 81-86. - Alfonso Castro, Jon Jacobsen;
*Regular solutions to elliptic equations*, Special Issue 02 (2023), pp. 87-100. - David G. Costa;
*Remarks on compactness conditions and their application*, Special Issue 02 (2023), pp. 101-107. - Briceyda B. Delgado, Rosa Pardo;
*Resonant solutions for elliptic systems with Neumann boundary conditions*, Special Issue 02 (2023), pp. 109-124. - Marco G. Ghimenti, Anna Maria Micheletti;
*Yamabe boundary problem with scalar-flat manifolds target*, Special Issue 02 (2023), pp. 125-133. - Elliott Hollifield;
*Positive solutions for nonlinear fractional Laplacian problems*, Special Issue 02 (2023), pp. 135-149. - Gabriela Holubova;
*Optimal conditions for the maximum principle for second-order periodic problems*, Special Issue 02 (2023), pp. 151-160. - Ian Knowles, Sundar Tamang;
*Inverse volatility problem for currency options*, Special Issue 02 (2023), pp. 161-173. - Meiqin Li, Bingbing Ji;
*Local min-orthogonal principle and its applications for solving multiple solution problems*, Special Issue 02 (2023), pp. 175-192. - Maria C. Mariani, Peter K. Asante, William Kubin, Osei K. Tweneboah, Maria Beccar-Varela;
*Determining the background driving process of the Ornstein-Uhlenbeck model*, Special Issue 02 (2023), pp. 193-207. - Nsoki Mavinga, Quinn A. Morris, Stephen B. Robinson;
*Fucik spectrum with weights and existence of solutions for nonlinea*, Special Issue 02 (2023), pp. 209-230. - Seshadev Padhi, Julio G. Dix;
*Existence of positive global radial solutions to nonlinear elliptic systems*, Special Issue 02 (2023), pp. 231-238. - Peter Takac;
*Nonlinear diffusion with the p-Laplacian in a Black-Scholes-type model*, Special Issue 02 (2023), pp. 239-253. - Glenn Webb;
*Nonlocal advection diffusion equations and the two-slit experiment in quantum mechanics*, Special Issue 02 (2023), pp. 255-267.

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