Upper Bound of second Hankel determinant for certain generalized glass of starlike functions / Muhammad AqiI Shahruddin ... [et al.]

The study of Hankel determinant is one of the most famous coefficient inequalities in geometric theory tiinctions that still being study by many researchers. At the end of 2020, theresearch on Hankel determinant have reach to the fourth Hankel determinant, H (1)4.
In a nutshell, the aim is to find the second Hankel determinant, H2(2) on certain subclasses of analytic functions. The method is inspired by the method used by Janteng et al. (2007), Kaharudin et al. (2011) and Yahya et al. (2013). This method used by many researchers and produced plenty of subclasses of analytic function.