TY - GEN A1 - Friedland, Shmuel A1 - Virnik, Elena T1 - Nonnegativity of Schur complements of nonnegative projectors N2 - In this note we prove that the Schur complement of a nonnegative idempotent matrix, i.e. a nonnegative projector, is again a nonnegative idempotent matrix for certain generalized inverses. KW - Nonnegative projectors KW - idempotent matrices KW - Schur complement KW - Moore-Penrose inverse KW - generalized inverse Y1 - 2008 UR - https://opus4.kobv.de/opus4-matheon/frontdoor/index/index/docId/436 UR - https://nbn-resolving.org/urn:nbn:de:0296-matheon-4365 ER -