Positivity of sums and integrals for higher order nabla-convex and completely monotonic functions

Faraz Mehmood, Asif R. Khan, Muhammad Adnan

We extend the definitions of $\nabla -$convex and completely monotonic functions for two variables. Some general identities of Popoviciu type for sum $\sum \sum p_{ij}f(y_i,z_j)$…