ARRRadojević, IvanaĐorđević, Dragan2025-05-132025-05-1320170354-518010.2298/FIL1712847Rhttps://repozitorijum.tfbor.bg.ac.rs/handle/123456789/5969We present the definition and some properties for the Moore-Penrose inverse in possibly degenerate indefinite inner product spaces. The extensions of appropriate results, given for matrices in Euclidean and nondegenerate indefinite inner product spaces are established. All this is done by using the concept of linear relations.enMoore-Penrose invereIndefinite inner productAdjointLinear relationarticle