NordConsNet Workshop 2023
The Nordic Constraint Network (NordConsNet) Workshop is a yearly event that gathers researchers and industrial practitioners from the Nordic countries to disseminate results about ongoing research, share knowledge about existing projects and foster further development of the network. The NordConsNet Workshop 2023 is the 19th edition of this annual event.
IMADA Institutforum
Alle ansatte ved IMADA inviteres til institutforum. Mødeindkaldelse og dagsorden bliver tilsendt per mail.
Kollokvium: Computing better approximate pure Nash equilibria in cut games via semidefinite programming
Speaker: Ioannis Caragiannis, Department of Computer Science, Aarhus University Abstract: Cut games are among the most fundamental strategic games in algorithmic game theory. It is well-known that computing an exact pure Nash equilibrium in these games is PLS-hard, so research has focused on computing approximate equilibria. We present a polynomial-time algorithm that computes 2.7371-approximate pure Nash equilibria in cut games. This is the first improvement to the previously best-known bound of 3, due to the work of Bhalgat, Chakraborty, and Khanna from EC 2010. Our algorithm is based on a general recipe proposed by Caragiannis, Fanelli, Gravin, and Skopalik from FOCS 2011 and applied on several potential games since then. The first novelty of our work is the introduction of a phase that can identify subsets of players who can simultaneously improve their utilities considerably. This is done via semidefinite programming and randomized rounding. In particular, a negative objective value to the semidefinite program guarantees that no such considerable improvement is possible for a given set of players. Otherwise, randomized rounding of the SDP solution is used to identify a set of players who can simultaneously improve their strategies considerably and allows the algorithm to make progress. The way rounding is performed is another important novelty of our work. Here, we exploit an idea that dates back to a paper by Feige and Goemans from 1995, but we take it to an extreme that has not been analyzed before. Joint work with Zhile Jiang (to appear in STOC 2023)
QM Masterclass: Geometric Variational Problems
Deltag i en QM Masterclass om Geometric Variational Problems under ledelse af Jean-Pierre Bourguignon fra IHÉS og David Langlois fra CNRS. Tilmeld dig nu!
QM Masterclass: Geometric Variational Problems
Deltag i en QM Masterclass om Geometric Variational Problems under ledelse af Jean-Pierre Bourguignon fra IHÉS og David Langlois fra CNRS. Tilmeld dig nu!
QM Masterclass: Geometric Variational Problems
Deltag i en QM Masterclass om Geometric Variational Problems under ledelse af Jean-Pierre Bourguignon fra IHÉS og David Langlois fra CNRS. Tilmeld dig nu!
QM Masterclass: Geometric Variational Problems
Deltag i en QM Masterclass om Geometric Variational Problems under ledelse af Jean-Pierre Bourguignon fra IHÉS og David Langlois fra CNRS. Tilmeld dig nu!
QM Masterclass: Geometric Variational Problems
Deltag i en QM Masterclass om Geometric Variational Problems under ledelse af Jean-Pierre Bourguignon fra IHÉS og David Langlois fra CNRS. Tilmeld dig nu!
DIAS X FNUG Wednesday lecture: Can there be a (mathematically-grounded) “physics” of learning?
Inaugural lecture by Mathematician Keith Devlin, Stanford University Can there be a (mathematically-grounded) “physics” of learning? Technically, modern physics is a precisely defined model of the “physical” world and universe we live in – as perceived by our minds, augmented by various observational technologies and measurement devices. As such, it has proved enormously successful not only in increasing dramatically our understanding of the universe we live in, including what we are made of and how it works, but also in construction-, civil-, mechanical-, automotive-, aerospace- and electrical-engineering, resulting in we humans living our lives in a manner totally unlike any other creatures on Earth. Chemistry performs a similar model to support biology, medicine, and pharmacology. Can there be an analogous model that provides a framework for the social and psychological domains, including learning and education? The lecture takes place in the DIAS Auditorium, Fioniavej 34. Everybody is welcome and no registration is needed. Live stream it at youtube.com/@danish-ias