Ical
https://mathematics.huji.ac.il/calendar?type=month&month=term
en<a href="https://mathematics.huji.ac.il/event/colloquium-janos-pach-nyu?delta=0" >Colloquium: Janos Pach (Rényi Institute, Budapest and MIPT, Moscow) — Erdős, Hajnal, and their relatives</a>
https://mathematics.huji.ac.il/event/colloquium-janos-pach-nyu
<br />Erdős and Hajnal showed that graphs satisfying any fixed hereditary property contain much larger cliques or independent sets than what is guaranteed by (the quantitative form of) Ramsey's theorem. We start with a whirlwind tour of the history of this observation, and then we present some new results for ordered graphs, that is, for graphs with a linear ordering on their vertex sets. In particular, we prove that for every positive integer $k$, there exists a constant $c=c(k)>0$ such that any ordered graph $G$ on $n$ vertices with the property that neither $G$ nor its complement contains an induced monotone path of size $k$, has either a clique or an independent set of size at least $n^c$. This strengthens a theorem of Bousquet, Lagoutte, and Thomassé, who proved the analogous statement for unordered graphs. Joint work with <span><span>István</span></span> Tomon.<br />Zoom link: <br /><a href="https://huji.zoom.us/j/89226008137?pwd=blZtN2JicFp5TVp4ZmdsUnpNR1Y1dz09">https://huji.zoom.us/j/89226008137?pwd=blZtN2JicFp5TVp4ZmdsUnpNR1Y1dz09</a>Thu, 03 Dec 2020 12:30:00 +0000Anonymous1678926 at https://mathematics.huji.ac.il<a href="https://mathematics.huji.ac.il/event/colloquium-aaron-naber-northwestern?delta=0" >Colloquium: Aaron Naber (Northwestern) — Recent advances on the Structure of Spaces with Lower and Bounded Ricci Curvature</a>
https://mathematics.huji.ac.il/event/colloquium-aaron-naber-northwestern
<br />The talk will introduce, hopefully at a basic level, the meaning and analysis of spaces with Ricci curvature bounds. We will discuss the process of limiting spaces with such bounds, and studying the singularities on these limits. The singularities come with a variety of natural structure which have been proven in the last few years, from dimension bounds to rectifiable structure, which is (measure-theoretically) a manifold structure on the singular set. If time permits we will discuss some recent work involving the topological structure of boundaries of such spaces. From a general perspective the analysis and ideas involved are applicable to a wide range of nonlinear pde's with singularities, especially those which tend to arise in geometric analysis.<br /><br />Zoom link: <a href="https://huji.zoom.us/j/81160433663?pwd=b3FsbDVRV0hLUysrejlWVlhsNjhiQT09">https://huji.zoom.us/j/81160433663?pwd=b3FsbDVRV0hLUysrejlWVlhsNjhiQT09</a>Thu, 10 Dec 2020 12:30:00 +0000Anonymous1678924 at https://mathematics.huji.ac.il<a href="https://mathematics.huji.ac.il/event/colloquium-nathan-keller-biu?delta=0" >Colloquium: Nathan Keller (BIU)</a>
https://mathematics.huji.ac.il/event/colloquium-nathan-keller-biu
Thu, 24 Dec 2020 12:30:00 +0000Anonymous1977098 at https://mathematics.huji.ac.il<a href="https://mathematics.huji.ac.il/event/colloquium-gilles-francfort-universit%C3%A9-paris-13-and-nyu?delta=0" >Colloquium: Gilles Francfort (Université Paris 13 and NYU)</a>
https://mathematics.huji.ac.il/event/colloquium-gilles-francfort-universit%C3%A9-paris-13-and-nyu
Thu, 07 Jan 2021 12:30:00 +0000Anonymous1705728 at https://mathematics.huji.ac.il<a href="https://mathematics.huji.ac.il/event/colloquium-cornelius-greither-bundeswehr-university-munich?delta=0" >Colloquium: Cornelius Greither (Bundeswehr University Munich)</a>
https://mathematics.huji.ac.il/event/colloquium-cornelius-greither-bundeswehr-university-munich
Thu, 21 Jan 2021 12:30:00 +0000Anonymous2196591 at https://mathematics.huji.ac.il