Abstract
The purpose of this study is to define a new class of harmonically convex functions, which is known as left and right harmonically convex interval-valued function (LR-& x1d4d7;& xdcd7;-convex IV-F), and to establish novel inclusions for a newly defined class of interval-valued functions (IV-Fs) linked to Hermite-Hadamard (H-H) and Hermite-Hadamard-Fejer (H-H-Fejer) type inequalities via interval-valued Riemann-Liouville fractional integrals (IV-RL-fractional integrals). We also attain some related inequalities for the product of two LR-& x1d4d7;& xdcd7;-convex IV-Fs. These findings enable us to identify a new class of inclusions that may be seen as significant generalizations of results proved by Iscan and Chen. Some examples are included in our findings that may be used to determine the validity of the results. The findings in this work can be seen as a considerable advance over previously published findings.