Estimation of the functional A_2 • A_3 In the class of bounded symmetric univalent functions

Pietrasik, Longin

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The paper is devoted to a class of functions analytic, univalent, bounded and non-vanishing in the unit disk and in addition, symmetric with respect to the real axis. Variational formulas are derived and, as applications, estimates are given of the first and second coefficients in the considered class of functions.