AIMS MATHEMATICS, cilt.8, sa.5, ss.10435-10452, 2023 (SCI-Expanded)
In this paper, the Hermite-Hadamard inequality and its generalization for quasi p-convex
functions are provided. Also several new inequalities are established for the functions whose first
derivative in absolute value is quasi p-convex, which states some bounds for sides of the HermiteHadamard inequalities. In the context of the applications of results, we presented some relations
involving special means and some inequalities for special functions including digamma function and
Fresnel integral for sinus. In addiditon, an upper bound for error in numerical integration of quasi
p-convex functions via composite trapezoid rule is given.