# Talks

Some 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.

- 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.**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