Let $f_n$ be a sequence of real-valued functions that goes in $L^2$ to $f$,
$$\Vert f_n - f \Vert_{L^2} \to 0 $$
"Show that $f_n$ have an optimal convergence rate in $L^2$" What does that mean ?
2026-04-03 21:42:04.1775252524
What is an "optimal convergence rate" ?
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