An extension of Petrović's inequality for \(h-\)convex (\(h-\)concave) functions in plane

In this paper, Petrović’s inequality is generalized for h − convex functions on coordinates with the condition that h is supermultiplicative. In the case, when h is submultiplicative, Petrović’s inequality is generalized for h − concave functions. Also particular cases for P − function, Godunova-Levin functions, s − Godunova-Levin functions and s − convex functions has been discussed.