This paper concerns equilibrium problems in real metric linear spaces. Considering a modified notion of  upper sign property for bifunctions, we obtain the relationship between the solution sets of the local Minty equilibrium problem and the equilibrium problem, where the technical conditions on $f$ used in the literature are relaxed. The KKM technique is used to generalize and unify some exist...

In the two-echelon vehicle routing problem (2E-VRP), distribution network is split into two echelons. Different vehicles are operated on first and second echelon to maintain economies of scale adhere any restrictions that may be present in either echelon. Intermediate facilities located at borders echelons facilitate consolidation transshipment goods between Examples systems include express del...

The theory of wicked problems, originating from Western academic discussion, has evolved since the 2000s toward a universal diagnostic societal challenges. In this article, we employ systematic literature review to investigate application concept problems in studies focusing on African context. Our aim is understand additional value and limitations using non-Western frame reference. We conclude...