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math.FA2024
A note on a Halmos problem
Maximiliano Contino, Eva Gallardo-Gutierrez
We address the existence of non-trivial closed invariant subspaces of operators on Banach spaces whenever their square have or, more generally, whether there exists a pol…
math.FA2024
Global solutions of approximation problems in Krein spaces
Maximiliano Contino
Three approximation problems in Krein spaces are studied, namely the indefinite weighted least squares problem and the related problems of indefinite abstract splines and smoothing…