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Abstract
This thesis deals with some function spaces and classes of holomorphic and meromorphic functions in the unit disk .
We study some interesting classes of functions such as Bloch,weighted Bloch,α-Bloch,Hardy,Bergman,dirichlet,qk and F(p,q,s)spaces.
We apply composition operators on some of these classes to obtain strong and new characterizations of several classes of functions like F (p,q,s),F10(p,q,s),Bloch ,weighted Bloch and Nk classes.