For several decades, scholars have developed methods for solving optimization problems which emerge in economics, econometrics, operations research, and other disciplines. A considerable effort has been made to construct equations from which constraints can be derived, but surprisingly little...

Reducing disparities among regions within European countries is the aim of European and national structural policies. In particular, a European grant contributes to the German governmental program for equalizing regional unemployment. The goal is to bring it down to the national average by...