Document Type : Research Paper


Shahid Bakeri High Education Center of Miandoab, Urmia University, Urmia, Iran.


In this paper, we considered composition operators on weighted Hilbert spaces of analytic functions and  observed that a formula for the  essential norm, gives a Hilbert-Schmidt characterization and characterizes the membership in Schatten-class for these operators. Also, closed range composition operators  are investigated.


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