Approximation Algorithms for the k-Set Packing Problem -- On Linear and Semidefinite Programs for Polytopes in Combinatorial Optimization -- The Shortest Separating Cycle Problem -- Dynamic Traveling Repair Problem with an Arbitrary Time Window -- A PTAS for the Cluster Editing Problem on Planar Graphs -- Bin Packing with Colocations -- Batch Coloring of Graphs -- New Integrality Gap Results for the Firefighters Problem on Trees -- A Multiplicative Weights Update Algorithm for Packing and Covering Semi-Infinite Linear Programs -- Balanced Optimization with Vector Costs -- Vertex Sparsification in Trees -- Scenario Submodular Cover -- Non-Greedy Online Steiner Trees on Outerplanar Graphs -- A Refined Analysis of Online Path Coloring in Trees -- Resource Allocation Games with Multiple Resource Classes -- Tight Approximation Bounds for the Seminar Assignment Problem -- A Priori TSP in the Scenario Model -- Local Search Based Approximation Algorithms for Two-Stage Stochastic Location Problems. .