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We denote this subordination by f (z)≺ g (z). Furthermore, if the function g (z) is univalent in U, then f (z)≺ g (z), z∈ U⇔ f (0)= g (0) and f (U)⊂ g (U). Let P denote the class of analytic functions h (z) with h (0)= 1, which are convex univalent in U and for which H {h (z)}> 0, z∈ U.