Differential Equations & Applications · Volume 15, Issue 3 Unique solvability of second order nonlinear totally characteristic equations 15-14 Pages 269-284 DOI 10.7153/dea-2023-15-14 Downloads Short PDF Full PDF PNG Authors Michael E. Sta. Brigida Jose Ernie C. Lope Keywords singular equation unique solvability totally characteristic equation Subject classes 35A01 35A02 35A10 35G20