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I posted the same question to Math Stackexchange earlier without much luck, so I am posting here. I am dealing with a time-dependent model, which can be expressed as a function. $f$ is dependent on ...

Greetings. Suppose that $H$ is a separable infinite-dimensional Hilbert space and that $M$ is an infinite dimensional closed subspace of $H$. Suppose that {$v_{n}: n\ge 1$} is an infinite linearly ...