Abstract
For left and right lambda-preinvex interval-valued functions (left and right lambda-preinvex IVFs) in interval-valued Riemann operator settings, we create Hermite-Hadamard (H-H) type inequalities in the current study. Additionally, we create Hermite-Hadamard-Fejer (H-H-Fejer)-type inequalities for preinvex functions of the left and right interval-valued type under some mild conditions. Moreover, some exceptional new and classical cases are also obtained. Some useful examples are also presented to prove the validity of the results.