Artículos de revistas
Weighted projections into closed subspaces
Fecha
2013-08Registro en:
Corach, Gustavo; Fongi, Guillermina; Maestripieri, Alejandra Laura; Weighted projections into closed subspaces; Polish Acad Sciences Inst Mathematics; Studia Mathematica; 216; 8-2013; 131-148
0039-3223
Autor
Corach, Gustavo
Fongi, Guillermina
Maestripieri, Alejandra Laura
Resumen
We study A-projections, i.e. operators on a Hilbert space H which act as projections when a seminorm is considered in H. The A-projections were introduced by Mitra and Rao (1974) for finite-dimensional spaces. We relate this concept to the theory of compatibility between positive operators and closed subspaces of H. We also study the relationship between weighted least squares problems and compatibility.