Second Hankel determinant for certain subclasses of bi-univalent functions involving Chebyshev polynomials

Halit Orhan, Evrim Toklu, Ekrem Kadıoğlu

In this paper our purpose is to find upper bound estimate for the second Hankel determinant $|a_2{a}_4-a_3^2|$ for functions defined by convolution belonging to the class $\m…