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- Combinatorics, Computing, and Randomness,
coordinated by He Sun
We study fundamental algorithmic problems that arise in various fields of mathematics and computer science. Historically we have focused on problems in graph theory, algebra, data structures, and approximation and online algorithms. Discrete Mathematics deals with finite objects, which usually do not have an algebraic structure. Examples are graphs, sequences or set systems. Since such objects play a central role in computer science, there is a rich exchange between the two fields.

- Combinatorial Optimization,
coordinated by Andreas Karrenbauer and Kurt Mehlhorn
Many real world applications are naturally formulated as combinatorial optimization problems, i.e. problems of finding the best solution(s) out of a finite set. Various methods have been developed to tackle such problems: integer programming, fixed-parameter tractable and exact algorithms, approximation algorithms and combinatorial algorithms, among others. D1 works on applying these methods to various problems from different areas, ranging from bioinformatics to geometry, to scheduling, and several others.

- Geometry, Topology, and Algebra,
coordinated by Michael Kerber and Michael Sagraloff
We work on efficient algorithms in the areas of computational geometry and topology. Our focus lies on approaches that relates these areas to computer algebra; in particular, we investigate efficient methods for handling curves and surfaces defined by algebraic equations and for understanding the topological structure of geometric data. We also make our algorithmic results available in mature software libraries such as CGAL.

- Algorithmic Game Theory,
coordinated by Martin Hoefer
In the problems we consider in this group, we usually try to optimize some goal function while dealing with selfish agents that may have separate and conflicting goals, and that may lie to us in order to improve their own goal function. In algorithmic mechanism design, we ensure that it is in the best interest of the agents to tell us the truth. We also examine the price of anarchy and price of stability for various problems.

A detailed report of our work is given in the Biennial Report 2011 (120 MB).

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