Upper bound of second Hankel determinant for subclass of close-to-convex functions / Muhammad Fazrul Azmi... [et al.]

Geometric function theory is an extraordinary area of complex analysis. This area of
study is more often associated with geometric properties of analytic function such as
extremal properties, radius properties, representation theorem and coefficient bound.
Many researchers raised the interest in studying properties in different classes that have
been introduced. In this research, we focus on defining new subclasses of analytic
functions, L(a,<5,t,s) afterwards determining the upper bound of second Hankel
determinant for the selected class of function.