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Abstract The purpose of this thesis is to de ne and study properties for certain classes of univalent and pvalent functions de ned in the open unit disc U = fz 2 C : jzj < 1g; where C is the complex plane. These classes are de ned by using some linear operators, integral operators, Hadamard product (or convolution) and higher order derivative . Let A denote the class of all functions of the form f(z) = z + 1X k=2 akzk; (1) which are analytic in U. Also let S denote the subclass of functions of A which are univalent in U: Further let T the subclass of S all functions of the form: f(z) = z 1X k=2 akzk (ak 0) : For two functions f(z) and g (z) in A given by g(z) = z+ 1P k=2 bkzk; the Hadamard product (or convolution) (f g)(z) is de ned by (f g)(z) = z + 1P k=2 akbkzk = (g f)(z): De nition 1 [70]. A function f(z) 2 S is said to be starlike of order if and only if Re zf0(z) f(z) > ; for some (0 < 1) and for all z 2 U: The class of all starlike functions of order is denoted by S () : De nition 2 [70]: A function f(z) belonging to S is said to be convex of order if and only if Re 1 + zf00(z) f0(z) > ; for some (0 < 1) and for all z 2 U: The class of all convex functions of order is denoted by K () : |