coefficient bounds univalent functions 2 COEFFICIENTS 1 ELEMENTS 1 Erdély–Kober fractional-order derivative 1 Fekete–Szegö inequalities 1 HANKEL 1 Hankel determinant 1 Hohlov operator 1 INEQUALITIES 1 Sălăgean operator 1 Toeplitz determinants 1 analytic and bi-univalent functions 1 analytic functions 1 bi-univalent functions 1 q-Chebyshev polynomials 1 starlike functions 1 subordination 1