For a monotone convex function f ∈ C[a, b] we prove that the modulus of continuity w(f; h) is concave on [a, b] as function of h. Applications to approximation theory are obtained.
AMIRI, H. A., & FERNANDO, T. S. (1990). ON CLOSE-TO-CONVEX FUNCTIONS OF COMPLEX ORDER. International Journal of Mathematics and Mathematical Sciences, 1990(), 321-330. https://doi.org/10.1155/S0161171290000473