Video Lectures

Some years ago, I proved with Shulman and Sørensen that precisely 12 of the 17 wallpaper groups are matricially stable in the operator norm. We did so as part of a general investigation of when group C∗C∗-algebras have the semiprojectivity and weak...

Expander graphs are graphs which simultaneously are both sparse and highly connected. The theory of expander graphs received a lot of attention in the past half a century, from both computer science and mathematics. In recent years, a new theory of...

With gate error rates in multiple technologies now below the threshold required for fault-tolerant quantum computation, the major remaining obstacle to useful quantum computation is scaling, a challenge greatly amplified by the huge overhead imposed...

Valiant (1980) showed that general arithmetic circuits with negation can be exponentially more powerful than monotone ones. We give the first qualitative improvement to this classical result: we construct a family of polynomials P-n in n variables...

One of the earliest fundamental applications of Lagrangian Floer theory is detecting the non-displaceablity of a Lagrangian submanifold. Many progress and generalisations have been made since then but little is known when the Lagrangian submanifold...

The Milky Way is a unique testbed for theories of galaxy formation and evolution. Especially the stellar halo is amenable to studies into our galaxy’s past both because it contains some of the oldest stars and because the dynamical timescales are...

Continuation of the talk from Feb 4.

“The European Qur’ān” (EuQu: https://euqu.eu/) is an ongoing project funded by a Synergy Grant of the European Research Council (ERC), dedicated to the important place of the Muslim holy book in European cultural and religious history. From the 12th...

“The European Qur’ān” (EuQu: https://euqu.eu/) is an ongoing project funded by a Synergy Grant of the European Research Council (ERC), dedicated to the important place of the Muslim holy book in European cultural and religious history. From the 12th...

“The European Qur’ān” (EuQu: https://euqu.eu/) is an ongoing project funded by a Synergy Grant of the European Research Council (ERC), dedicated to the important place of the Muslim holy book in European cultural and religious history. From the 12th...