Santanu Dey

Santanu Dey

Past Awards

Optimization Society Student Paper Prize: Winner(s)
Winning material: “On the Chvátal-Gomory Closure of a Compact Convex Set”
2011 - Winner(s)

The paper shows that the Chvátal-Gomory closure of compact convex sets is a rational polytope. For the special case of rational polytopes, this is a well-known result. The new result includes the case of irrational polytopes and thus resolves a question that was posed by Schrijver (1980) and had remained open since. Solving this long-open question is already a wonderful contribution, finally completing the Chvátal-Gomory theory for polytopes. The paper goes beyond this and also provides a solution for arbitrary compact convex sets, completing the program started in a paper by Dey and Vielma (2010) for the case of ellipsoids and continued in an earlier paper by Dadush, Dey, and Vielma (2011) for the case of strictly convex bodies. The importance of this contribution lies in providing a foundation for a finite linear cutting plane theory for convex integer optimization.

The paper uses techniques from convex geometry and the geometry of numbers in an expertly way. In the proofs, the authors avoid explicit calculations in favor of soft analysis, including techniques from point-set topology, which makes the paper particularly elegant.

Prize committee

Matthias Koeppe (Chair), Jean-Philippe Richard, Katya Scheinberg

Junior Faculty Forum Paper Competition: Finalist
Winning material: The Chatal-Gomory Closure of a Strictly Convex Body

George Nicholson Student Paper Competition: First Place
Winning material: "Sequential-Merge Facets for High-Dimensional Infinite Group Problems"