In this paper, we establish different variants of fractional Hermite-Hadamard
inequalities for subadditive functions via Riemann-Liouville fractional
integrals. Moreover, we offer some fractional integral inequalities for the
product of two subadditive functions via Riemann-Liouville fractional
integrals. It is also shown that the inequalities offered in this research
are the generalization of the already given inequalities for convex
functions and subadditive functions.