Talks

Some of the most user friendly versions of my talks and talks of my students are here. Some of these are crosslisted under “Research interests, and selected publications”. That page also contains some older talks.

• A combinatorial approach to Ramana’s exact dual for semidefinite programming ISMP 2024,
  ACORN conference, Carnegie Mellon, oct 11, 2025
• Combinatorial certificates in SDP duality: how elementary row operations help
  Vienna Workshop on Computational Optimization june 5 2025; Georgia Tech ARC Colloquium, sept 22 2025;   Texas A&M Industrial and Systems Engineering Colloquium, feb 6, 2026
• How do exponential size solutions arise in semidefinite programming? Poster talk at the MIP 2021 conference, May 24, 2021 2nd prize to Alex Touzov
• On positive duality gaps in semidefinite programming
  Johann Radon Institute, Workshop on Conic and Copositive Optimization, December 2020.
• Characterizing Bad Semidefinite Programs: Normal Forms and Short Proofs
  Egon Balas Memorial Conference, Carnegie Mellon University, October 2019.
• Combinatorial characterizations in semidefinite programming: how elementary row operations help
  CAM colloquium, University of Chicago, October 2019.
• Sieve-SDP: a simple facial reduction algorithm to preprocess semidefinite programs
  Poster talk of Yuzixuan Zhu at the 2018 Princeton Optimization Day, sept 2018. First poster prize in the Algorithms category.
• Sieve-SDP: a simple facial reduction algorithm to preprocess semidefinite programs
  Talk of Yuzixuan Zhu at ISMP 2018,July 2018
• Bad semidefinite programs, now with short proofs
  Talk at Fields Institute, Workshop on Modern Convex Optimization and Applications July 2017
• Exact duals and short certificates of infeasibility and weak infeasibility in conic linear programming
  Shinji Mizuno birthday conference, Aug 2016
• Combinatorial certificates in semidefinite programming
  Danish Technical University, June 2016. This talk roughly combines the two talks below.
• Exact duality in semidefinite programming based on elementary reformulations
  Tamas Terlaky’s birthday conference June 2015
• Bad semidefinite programs: they all look the same UC San Diego, May 2014