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- ItemOn a Subordination Result of a Subclass of Analytic Functions(2017) Risikat Ayodeji BelloIn this paper, we investigate a subordination property and the coefficient inequality for the class M (1,b) , The lower bound is also provided for the real part of functions belonging to the class M (1,b) .
- ItemOn Some Properties of a Class of Analytic Functions Defined by Opoola Differential Operator(2024-07-21) Risikat A. BelloThe Fekete-Szego functional upper bounds and the Second Hankel Determinant upper bounds for a class of analytical functions defined by the Opoola Differential Operator are found in this study. The estimations made are accurate with the theorems proved.
- ItemToeplitz Determinants for a Subclass of Ana- lytic Functions(2021-03-21) AYINLA, Rasheed O; BELLO, Risikat, AA new subclass of analytic functions that generalizes some known subclasses of analytic functions was defined and investigated.The bounds for Toeplitz determinants of T2(2); T2(3); T3(1) and T3(2) were obtained
- ItemUpper Bounds for Fekete-Szego functions and the Second Hankel Determinant for a Class of Starlike functions(2017-04-30) Bello R. A.; Opoola T. O.In this work,we provide upper estimate for Fekete-Szego functional and Second Hankel determinant for the class šā{š} consisting of functions analytic in the unit disk U = {zā C : |z| < 1} and normalized by f (0) =šā² (0) = 1 = 0 and which satisfies the subordination condition
- ItemCoefficient Estimate for a Subclass ofAnalytic Functions Defined by aGeneralizedDifferential Operator(2023)The purpose of this paper is to study the coefficient estimates of the class of functions in ()consisting of starlike functions. The sharp upper bounds for the initial coefficients and the Fekete-Szego functional of the functions in the class were established using the Opoola Differential Operator