Affiliation: | aDepartment of Mathematics, University of California, San Diego, La Jolla, CA 92093, United States;bDepartment of Management Science and Engineering, Stanford University, Stanford, CA 94305, United States;cYahoo! Research, Sunnyvale, CA 94089, United States;dComputer Science Department, Courant Institute of Mathematical Sciences, New York University, New York, NY 10012, United States |