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<正> Let f*g (z) be the convolution or Hadamard product of two functiom f(z) and g(z), that is, if f (z) =z+sum from n=2 to ∞a_nz~n and g(z) =z+sum from n=2 to ∞b_n z_n, then f*g(z)=z+sum from n=2 to ∞a_n b_n z~n (1) Let T denote the class of functio