2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34929We derive two sets of explicit algebraic constraint preserving boundary conditions for the linearized BSSN system. The approach can be generalized to inhomogeneous differential and evolution conditions, the examples of which are given. The proposed conditions are justified by an energy estimate on the original BSSN variables.10 pages, no figuresGeneral Relativity and Quantum Cosmologytext