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math.FA2004★ 1 cited
Complementary Lagrangians in Infinite Dimensional Symplectic Hilbert Spaces
Paolo Piccione, Daniel V. Tausk
Using the Spectral Theorem for unbounded self-adjoint operators we prove that any countable family of Lagrangian subspaces of a symplectic Hilbert space admits a common complementa…
math.FA2004
Some equivalence relations which are Borel reducible to isomorphism between separable Banach spaces
Valentin Ferenczi, Eloi Medina Galego
We improve the known results about the complexity of the relation of isomorphism between separable Banach spaces up to Borel reducibility, and we achieve this using the classical s…