עמוד זה מציג את כל האירועים המתרחשים במחלקה השבוע. ניתן לבחור שבוע אחר, או תאריכים שונים, בשדות בתחתית העמוד.

אשנב\צוהר למתמטיקה

What is the sum of angles of an n-gon? … Wait, I meant an n-gon in the 3-dimensional space!

נוב 12, 18:00—19:00, 2018, אולם 101-

מרצה

אורי בדר (מכון ויצמן)

תקציר

הרצאת אורח במסגרת סמינר ”Action Now“ שמתקיים ביום זה אצלנו

אחרי ההרצאה יתקיים קונצרט ג‘אז של ההרכב ”Perverse Sheaves“ של צחיק

קולוקוויום

Recent developments in 3-manifold topology

נוב 13, 14:30—15:30, 2018, Math -101

מרצה

Stefan Friedl (Regensburg University)

תקציר

We will explain the Geometrization Theorem proved by Perelman in 2003 and we will talk about the Virtual Fibering Theorem proved several years ago by Ian Agol and Dani Wise. I will not assume any previous knowledge of 3-manifold topology.

Combinatorics Seminar

Finitely Forcible Graphons

נוב 13, 16:10—17:10, 2018, 201

מרצה

Roman Glebov (BGU)

תקציר

Abstract: In extremal graph theory, we often consider large graphs that are in the limit uniquely determined by finitely many densities of their subgraphs. The corresponding limits (so-called graphons) are called finitely forcible. Motivated by classical results in extremal combinatorics as well as by recent developments in the study of finitely forcible graphons, Lovasz and Szegedy made some conjectures about the structure of such graphons. In particular, they conjectured that the topological space of typical points of every finitely forcible graphon is compact and finitely dimensional. In joint results with D. Kral, T. Klimosova, and J. Volec, we could disprove both conjectures.

AGNT

The Representation Theory of the finite and infinite Temperley-Lieb algebras

נוב 14, 15:10—16:25, 2018, -101

מרצה

Stephen Moore (BGU)

תקציר

The Temperley-Lieb algebras are a family of finite dimensional algebras that are quotients of the symmetric groups algebras, or more generally the Iwahori-Hecke algebras. They appear in a number of areas of mathematics, including statistical mechanics, knot theory, quantum groups, and subfactors. We review their representation theory and give some results on an infinite dimensional generalization.

BGU Probability and Ergodic Theory (PET) seminar

Sheltered sets, dead ends and horoballs in groups

נוב 15, 11:00—12:00, 2018, -101

מרצה

Jeremias Epperlein (Ben-Gurion University )

תקציר

The talk discusses a convexity structure on metric spaces which we call sheltered sets. This structure arises in the study of the dynamics of the maximum cellular automaton over the binary alphabet on finitely generated groups. I will discuss relations to horoballs and dead ends in groups and present many open questions. This is work in progress with Tom Meyerovitch.


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