The editors are publishing this special issue to celebrate the outstanding contribution of Stephan Dempe to the field of bilevel optimization.
The call-for-papers addresses the growing research interest in optimization from the theoretical as well as from the application point of view. The objective of this special issue of "Optimization" is to present advances in different areas of mathematical optimization, especially in those areas covered by the research of Stephan Dempe, including theoretical, numerical as well as application topics related to (optimistic and pessimistic) bilevel optimization, hierarchical optimization, Stackelberg games, min-max optimization, equilibrium- and complementarity-constrained optimization, robust optimization, semi-infinite optimization, and optimization under uncertainty.