Aksoy, ÜmitAksoy, UmitBegehr, HeinrichCelebi, A. OkayMathematics2024-07-052024-07-05201960025-584X1522-261610.1002/mana.2018000282-s2.0-85059574996https://doi.org/10.1002/mana.201800028https://hdl.handle.net/20.500.14411/3378Çelebi, Ahmet/0000-0002-3508-2590; Aksoy, Umit/0000-0002-6014-1898Linear and nonlinear elliptic complex partial differential equations of higher-order are considered under Schwarz conditions in the upper-half plane, Firstly, using the integral representations for the solutions of the inhomogeneous polyanalytic equation with Schvvarz conditions, a class of integral operators is introduced together with some of their properties. Then, these operators are used to transform the problem for linear equations into singular integral equations. In the case of nonlinear equations such a transformation yields a system of integro-differential equations. Existence of the solutions of the relevant boundary value problems for linear and nonlinear equations are discussed via Fredholm theory and fixed point theorems, respectively.eninfo:eu-repo/semantics/closedAccesscomplex partial differential equationpolyanalyticSchwarz problemupper half planeArticleQ2Q2292611831193WOS:000477086900001