HANKEL DETERMINANT OF GENERALISED CLASSES OF STARLIKE FUNCTIONS WITH RESPECT TO $m$-FOLD SYMMETRIC POINTS

Denote $\mathcal{S}$ to be the class of functions which are analytic, normalized and univalent in the open unit disk ${\mathbb{E}}= \{z \in \mathbb{C} : |z|<1\}.$ The upper bound for the functional $ |a_{m+1}a_{3m+1}-a_{2m+1}^{2}|$ with respect to $m$-fold symmetric points are determined.