Let $A$ be a Hilbert-Schmidt operator between two hilbert spaces $H_1$ and $H_2$, with singular value decomposition: $A = \sum_n \lambda_n u_n \otimes v_n$.

Now let $A_i$ be a sequence of operators converging to $A$ in Hilbert-Schmidt norm. Do the singular values of the $A_i$ converge to the singular values of $A$, and if so in what precise sense? What can we say about the singular vectors?

Finally, does this require that $H_1$ and $H_2$ be separable?


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