RT Journal Article T1 Solutions and Green’s function of the first order linear equation with reflection and initial conditions A1 Cabada Fernández, Alberto A1 Fernández Tojo, Fernando Adrián K1 Equations with involutions K1 Equations with reflection K1 Green's functions K1 Maximum principles K1 Comparison principloes K1 Periodic conditions AB This work is devoted to the study of the existence and sign of Green’s functions for first order linear problems with constant coefficients and initial (one point) conditions. We first prove a result on the existence of solutions of nth order linear equations with involutions via some auxiliary functions to later prove a uniqueness result in the first order case. We study then different situations for which a Green’s function can be obtained explicitly and derive several results in order to obtain information as regards the sign of the Green’s function. Once the sign is known, optimal maximum and anti-maximum principles follow PB Springer International Publishing SN 10.1186/1687-2770-2014-99 YR 2014 FD 2014 LK http://hdl.handle.net/10347/16906 UL http://hdl.handle.net/10347/16906 LA eng NO Cabada, A. & Tojo, F.A.F. Bound Value Probl (2014) 2014: 99. https://doi.org/10.1186/1687-2770-2014-99 NO FEDER and Ministerio de Educación y Ciencia, Spain, project MTM2010-15314. FPU scholarship, Ministerio de Educación, Cultura y Deporte, Spain DS Minerva RD 26 abr 2026