we study the history and recent developments in nonelementarymodel theory focusing on the framework of abstractelementary classes. we discuss the role of syntax and semanticsand the motivation to generalize first order model theory to nonelementaryframeworks and illuminate the study with concrete examplesof classes of models. this second part continues to study the question of catecoricitytrans...

Positive mathematical programming (PMP) has a substantial number of applications in the field agricultural and resource economics. Their focus often been placed on simulation analysis farmers’ response to drastic changes exogenous factors especially brought about by policy changes. In present study, an exploration was made widen application area PMP approach, targeting expectation toward farm-g...

concept of locating business units includes the most important factors in their success and one the most competitive advantage of industrial units. entrepreneurs have been considered in this context, and different mathematical models have been developed. this paper aims to develop a decision support system based on a mathematical model in linear programming. in a comprehensive approach to this ...