The single-item capacitated economic lot-sizing (CELS) problem is a fundamental problem of production and inventory management. The first fully polynomial approximation scheme (FPTAS) for this problem with concave cost functions was developed by Van Hoesel and Wagelmans [C.P.M. Van Hoesel,...

Problem Product Partition differs from the NP-complete problem Partition in that the addition operation is replaced by the multiplication operation. Furthermore it differs from the NP-complete problem Subset Product in that it does not contain the product value B in its input. We prove that...

Purpose: The Chinese Government encourages firms to diffuse their operational-level environmental management (EM) into their organization’s mission and strategy to develop strategic EM to promote sustainable development. The purpose of this paper is to utilize two concepts of institutional...