【摘 要】
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In this present investigation,we first give a survey of the work done so far in this area of Hankel determinant for univalent functions.Then the upper bound
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In this present investigation,we first give a survey of the work done so far in this area of Hankel determinant for univalent functions.Then the upper bounds of the second Hankel determinant $|a_2a_4-a_3^2|$ for functions belonging to the subclasses$S(\alpha,\beta),K(\alpha,\beta),^*_{s}(\alpha,\beta)$ and $K_{s}(\alpha,\beta)$ of analytic functions are studied.Some of the results,presented in this paper,would extend the corresponding results of earlier authors.
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