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math.FA2019
Semiclosed projections and applications
Maximiliano Contino, Alejandra Maestripieri, Stefania Marcantognini
We characterize the semiclosed projections and apply them to compute the Schur complement of a selfadjoint operator with respect to a closed subspace. These projections occur natur…
math.FA2019
Weighted operator least squares problems and the J-trace in Krein spaces
Maximiliano Contino, Alejandra Maestripieri, Stefania Marcantognini
Given B, C and W operators in the algebra L(H) of bounded linear operators on the Krein space H, the minimization problem min (BX - C)^#W(BX - C), for X in L(H), is studied when th…