[See Solution] Let (e_n)_1^∞ be a complete orthonormal sequence in a Hilbert space H and let lambda _n be a complex sequence. Show that there is a


Question: Let \(\left( {{e}_{n}} \right)_{1}^{\infty }\) be a complete orthonormal sequence in a Hilbert space H and let \({{\lambda }_{n}}\) be a complex sequence. Show that there is a bounded linear operator D on H such that \(D{{e}_{n}}={{\lambda }_{n}}{{e}_{n}}\) for all n if and only if \(\left( {{\lambda }_{n}} \right)\) is a bounded sequence. What is \(||D||\) when defined?

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