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 Toeplitz and Hankel operators with Carleson measure symbols Commun. Korean Math. Soc.Published online May 17, 2021 Jaehui Park Seoul National University Abstract : In this paper, we introduce Toeplitz operators and Hankel operators with complex Borel measures on the closed unit disk. When a positive measure $\mu$ on $(-1,1)$ is a Carleson measure, it is known that the corresponding Hankel matrix is bounded and vice versa. We show that for a positive measure $\mu$ on $\mathbb{D}$, $\mu$ is a Carleson measure if and only if the Toeplitz operator with symbol $\mu$ is a densely defined bounded linear operator. We also study Hankel operators of Hilbert--Schmidt class. Keywords : Toeplitz operators, Hankel operators, densely defined operators, Carleson measures MSC numbers : 47B35 Full-Text :

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