Zainab H. Mahmood

A Janowski positivity threshold for the sixth-order symmetric Toeplitz determinant of odd starlike functions

Abstract We establish a sharp positivity threshold for the sixth-order symmetric Toeplitz determinant $T_{6}(1)$ T 6 ( 1 ) over the Janowski family of odd starlike functions with real coefficients. Writing $\Phi (A,B)$ Φ ( A , B ) for an explicit nonnegative quantity built from t...