Structure of positive block-matrices and nonstationary prediction
In this paper, a study of nonstationary prediction using some angles between parts of the past and future of nonstationary processes is given. After a preliminary part, where the needed operatorial facts are studied in the third section a formula for angle operators using Schur complements is given in the fourth section. The last part contains applications of the results to the study of stationary processes, which are generalized to the nonstationary case. Also, an interpretation of a \textit{M. G. Krejn} and \textit{I. M. Spitkovskij} result [Anal. Math. 9, No.1, 23-41 (1983; Zbl 0582.15008)] is given.
scientific article; zbMATH DE number 4011565
scientific article