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math.FA2007
Difference of composition operators in the Polydiscs
Zhongshan Fang, Zehua Zhou
This paper gives some simple estimates of the essential norm for the difference of composition operators induced by and acting on bounded function space in the unit polydis…
math.FA2005
Composition operators on generalized Bloch spaces of the polydisk
Dana D. Clahane, Stevo Stevic, Zehua Zhou
Let p,q>0. We extend to the n-polydisk previous one-variable characterization results of K. Madigan on the -Lipschitz space and K. Madigan/A. Matheson on the Bloch space by obta…