Málstofa í stærðfræði Fyrirlesari: Sigurður Örn Stefánsson, University of Iceland Titill: The phase structure of random outerplanar maps Staðsetning: VRII-158 Tími: Mánudagur 30. október kl. 15:00 Ágrip: An outerplanar map is a drawing of a planar graph in the sphere which has the property that there is a face in the map such that all […]
Málstofa í stærðfræði Fyrirlesari: Bjarki Ágúst Guðmundsson, University of Iceland Titill: Enumerating permutations sortable by k passes through a pop-stack Staðsetning: VRII-158 Tími: Mánudagur 18. september kl. 15:00 Ágrip: In an exercise in the first volume of his famous series of books, Knuth considered sorting permutations by passing them through a stack. He noted that,
Málstofa í stærðfræði Fyrirlesari: Nuno Romao, IHES Titill: Vortex moduli and the physics of gauged sigma-models Staðsetning: Naustið, Endurmenntun Tími: Föstudagur 15. september kl. 13:30 Ágrip: Vortices appear as static and stable solutions in field theories known as gauged sigma-models; these are defined on surfaces and can have both linear and nonlinear targets. I will
Málstofa í stærðfræði Fyrirlesari: Uwe Leck and Ian Roberts, University of Flensburg and Darwin Titill: Extremal problems for finite sets related to antichains Staðsetning: Tg-227 (Tæknigarður, 2. hæð) Tími: Föstudagur 1. september kl. 13:30 Ágrip: This talk requires little more than mathematical maturity as it relates to problems concerning finite sets. The basic ideas are
Málstofa í stærðfræði Fyrirlesari: Marston Conder, University of Auckland Titill: Experimental Algebra and Combinatorics Staðsetning: Tg-227 (Tæknigarður, 2. hæð) Tími: Fimmtudagur 13. júlí kl. 11:00 Ágrip: Some 40 years after the computer-based proof of the 4-Colour Theorem by Appel and Haken, there is still a degree of healthy skepticism about the use of computers to
Málstofa í stærðfræði Fyrirlesari: Daniel Fernandez Moreno, University of Iceland Titill: Entanglement entropy at non-equilibrium in holography Staðsetning: Tg-227 (Tæknigarður, 2. hæð) Tími: Föstudagur 7. júlí kl. 13:20 Ágrip: In recent years, holographic models have proved to be successful at studying far-from-equilibrium physics. This provides a new approach to studying quantum quenches in strongly coupled
Málstofa í stærðfræði Fyrirlesari: Christopher Kellett, University of Newcastle (Australia) Titill: Back and Forth in Lyapunov’s Second Method: Non-Uniform Subtleties Staðsetning: Tg-227 (Tæknigarður, 2. hæð) Tími: Fimmtudagur 6. júlí kl. 13:20 Ágrip: Lyapunov’s second or direct method provides an easy-to-check sufficient condition for stability properties of equilibria. The converse question – given a stability property,
Málstofa í stærðfræði Fyrirlesari: Peter J. Olver, University of Minnesota Titill: Equivalence, Invariants, Puzzles, and Cancer Staðsetning: Tg-227 (Tæknigarður, 2. hæð) Tími: Föstudagur 9. júní kl. 16:00 Ágrip: A fundamental issue in computer vision is recognizing when two objects in an image are the „same“. The underlying mathematical apparatus for studying such equivalence problems is
PhD thesis defense rehearsal Fyrirlesari: Örn Arnaldsson, University of Minnesota Titill: Involutive moving frames Staðsetning: Tg-227 (Tæknigarður, 2. hæð) Tími: Þriðjudagur 6. júní kl. 10:50 Ágrip: Cartan’s equivalence method and the method of the equivariant moving frames are the two best known methods for solving equivalence problems in differential geometry, differential equations, calculus of variations
Málstofa í stærðfræði Fyrirlesari: Valentina Giangreco, University of Iceland Titill: Non-analyticity of holographic Rényi entropy in Lovelock gravity Staðsetning: Tg-227 (Tæknigarður, 2. hæð) Tími: Föstudagur 26. maí kl. 13:20 Ágrip: In the first part of my talk I will introduce the definition of Rényi entropy, and some basic concepts of the so-called holographic principle (AdS/CFT).