Geodesic
Orthogonal polynomials and middle Hankel operators on Bergman spaces
Studia Mathematica, Tome 102 (1992) no. 1, pp. 57-75 Cet article a éte moissonné depuis la source Institute of Mathematics Polish Academy of Sciences

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We introduce a sequence of Hankel style operators $H^k$, k = 1,2,3,..., which act on the Bergman space of the unit disk. These operators are intermediate between the classical big and small Hankel operators. We study the boundedness and Schatten-von Neumann properties of the $H^k$ and show, among other things, that $H^k$ are cut-off at 1/k. Recall that the big Hankel operator is cut-off at 1 and the small Hankel operator at 0. 
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Lizhong Peng;  ;  . Orthogonal polynomials and middle Hankel operators on Bergman spaces. Studia Mathematica, Tome 102 (1992) no. 1, pp. 57-75. doi: 10.4064/sm-102-1-57-75

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