Hankel determinant for $p$-valent starlike and convex functions of order $\alpha$

D. Vamshee Krishna, T. Ramreddy

The objective of this paper is to obtain an upper bound to the second Hankel determinant $|a_{p+1}a_{p+3}-a^2_{p+2}|$ for $p$-valent starlike and convex functions of order $\alpha$, using Toeplitz determinants.