2018
Nov
20

# Seminars

- 2018 Nov 20
# T&G: Gangotryi Sorcar (Hebrew University), On the topology of the Teichmuller space of negatively curved Riemannian metrics

2:00pm to 3:30pm## Location:

Room 209, Manchester Building, JerusalemThis talk is a survey on results concerning the Teichmuller space of negatively curved Riemannian metrics on M. It is defined as the quotient space of the space of all negatively curved Riemannian metrics on M modulo the space of all isotopies of M that are homotopic to the identity. This space was shown to have highly non-trivial homotopy when M is real hyperbolic by Tom Farrell and Pedro Ontaneda in 2009. - 2018 Nov 20
- 2018 Nov 21
- 2018 Nov 21
# Analysis Seminar: Asaf Shachar (HUJI) "Regularity via minors and applications to conformal maps"

12:00pm to 1:00pm## Location:

Room 70, Ross BuildingTitle: Regularity via minors and applications to conformal maps. Abstract: Let f:\mathbb{R}^n \to \mathbb{R}^n be a Sobolev map; Suppose that the k-minors of df are smooth. What can we say about the regularity of f? This question arises naturally in the context of Liouville's theorem, which states that every weakly conformal map is smooth. I will explain the connection of the minors question to the conformal regularity problem, and describe a regularity result for maps with regular minors. - 2018 Nov 21
# Set Theory Seminar: Yair Hayut "Chang's Conjecture"

2:00pm to 3:30pm## Location:

Ross 63Title: Chang's Conjecture (joint with Monroe Eskew) Abstract: I will review some consistency results related to Chang's Conjecture (CC). First I will discuss some classical results of deriving instances of CC from huge cardinals and the new results for getting instances of CC from supercompact cardinals, and present some open problems. Then, I will review the consistency proof of some versions of the Global Chang's Conjecture - which is the consistency of the occurrence many instances of CC simultaneously. We will aim to show the consistency of the statement: (\mu^+,\mu) -->> ( u^+, - 2018 Nov 21
# Graduate Student Seminar: Amichai Lampert - Fourier Uniform Sets

4:00pm to 5:00pm## Location:

Ross 63Abstract: Let G be a finite abelian group. We say that a given subset of G is uniform if all of its Fourier coefficients are small. We'll show that uniform sets are common and explore some of their nice additive properties. - 2018 Nov 22
# Basic Notions seminar : Zlil Sela - Basic conjectures and preliminary results in non-commutative algebraic geometry

4:00pm to 5:15pm## Location:

Ross 70**Speaker: Zlil Sela****Title: Basic conjectures and preliminary results in non-commutative algebraic geometry**

**Abstract**: Algebraic geometry studies the structure of varieties over

fields and commutative rings. Starting in the 1960's ring theorists

(Cohn, Bergman and others) have tried to study the structure of varieties

over some non-commutative rings (notably free associative algebras).

The lack of unique factorization that they tackled and studied in detail, - 2018 Nov 25
# Kazhdan seminar: Tomer Schlank "The Nonabelian Chabauty Method"

12:00pm to 2:00pm## Location:

Ross 70AAbstract: The Chabauty method is a remarkable tool which employs p-adic analitic methods (in particular Colman integration.) To study rational points on curves. However the method can be applied only when the genus of the curve in question is larger than its Mordell-Weil rank. Kim developed a sophisticated "nonableian" generalisation. We shall present the classical methid, and give an approachable introduction to Kim's method. I'm basically going to follow http://math.mit.edu/nt/old/stage_s18.html - 2018 Nov 25
# Kazhdan seminar: Karim Adiprasito "Positivity in combinatorics and beyond"

3:00pm to 5:00pm## Location:

Ross 70AAbstract: I will discuss applications of algebraic results to combinatorics, focusing in particular on Lefschetz theorem, Decomposition theorem and Hodge Riemann relations. Secondly, I will discuss proving these results combinatorially, using a technique by McMullen and extended by de Cataldo and Migliorini. Finally, I will discuss Lefschetz type theorems beyond positivity. Recommended prerequisites: basic commutative algebra