# Logic Seminar - Kyle Gannon

## Location:

**Kyle Gannon**will speal about

**Keisler measures in and around NIP**.

__Abstract:__

2020
Jan
08

11:00am to 1:00pm

Ross building - Room 63

2020
Jan
23

10:00am to 11:00am

Ross 70 a

A countable group is said to be homogeneous if whenever tuples of elements u, v satisfy the same first-order formulas there is an automorphism of the group sending one to the other. We had previously proved with Rizos Sklinos that free groups are homogeneous, while most surface groups aren't. In a joint work with Ayala Dente-Byron, we extend this to give a complete characterization of torsion-free hyperbolic groups that are homogeneous.

2020
Jan
05

2:00pm to 3:00pm

Elath Hall, 2nd floor, Feldman Building

We study issue-by-issue voting and robust mechanism design in multidimensional frameworks where privately informed agents

have preferences induced by general norms. We uncover the deep connections between dominant strategy incentive compatibility (DIC) on the one hand,

and several geometric/functional analytic concepts on the other. Our main results are:

1) Marginal medians are DIC if and only if they are calculated

with respect to coordinates defined by a basis such that the norm is orthant-monotonic in the associated coordinate system.

have preferences induced by general norms. We uncover the deep connections between dominant strategy incentive compatibility (DIC) on the one hand,

and several geometric/functional analytic concepts on the other. Our main results are:

1) Marginal medians are DIC if and only if they are calculated

with respect to coordinates defined by a basis such that the norm is orthant-monotonic in the associated coordinate system.

2020
Jan
01

2020
May
14

2020
Mar
18

12:00pm to 1:00pm

Ross 70

Abstract:

Weprove eigenfunction and quasimode estimates on compact Riemannian manifolds for Schr\”odingeroperators, $H_V=-\Delta_g+V$ involving critically singular potentials $V$ which weassume tobe in $L^{n/2}$ and/or the Kato class ${\mathcal K}$. Our proof is basedon modifying the oscillatory integral/resolvent approachthat was used to study the case where $V \equiv 0$ using recently developedtechniques by many authorsto study variable coefficient analogs of the uniform Sobolev estimates ofKenig, Ruiz and the speaker. Read more about Analysis Seminar: Cancelled

2020
Jan
02

12:00pm to 1:00pm

Seminar room 209, Manchester Building, Givat ram

2020
Jan
02

10:00am to 11:00am

Ross 70 a

Let Γ be a discrete group. A group Γ is called unitarisable if for any Hilbert space H and

any uniformly bounded representation π : Γ → B(H) of Γ on H there exists a bounded operator

S : H → H such that S^{−1}π(g)S is a unitary representation for any g ∈ Γ. It is well known that

amenable groups are unitarisable. It has been open ever since whether amenability characterises unitarisability of groups.

Dixmier: Are all unitarisable groups amenable?

One of the approaches to study unitarisability is related to the space of the Littlewood functions

any uniformly bounded representation π : Γ → B(H) of Γ on H there exists a bounded operator

S : H → H such that S^{−1}π(g)S is a unitary representation for any g ∈ Γ. It is well known that

amenable groups are unitarisable. It has been open ever since whether amenability characterises unitarisability of groups.

Dixmier: Are all unitarisable groups amenable?

One of the approaches to study unitarisability is related to the space of the Littlewood functions

2020
Jan
08

2:00pm to 3:00pm

221B

Title:Largest Singular Values of Products of \beta-Ensembles

2020
Mar
31

12:00pm to 1:00pm

2019
Dec
26

2019
Dec
25

1:30pm to 3:30pm

Ross 70

Title - Measure rigidity of Anosov flows via the factorization method.

Abstract: Anosov flows are central objects in dynamics, generalizing the basic example of a geodesic flow over a Riemann surface.

In the talk we will introduce those flows and their dynamical behavior.

Moreover, we show how the factorization method, pioneered by Eskin and Mirzakhani in their groundbreaking work about measure rigidity for the moduli space of translation surfaces, can be adapted to smooth ergodic theory and in particular towards the study of Anosov flows.

Abstract: Anosov flows are central objects in dynamics, generalizing the basic example of a geodesic flow over a Riemann surface.

In the talk we will introduce those flows and their dynamical behavior.

Moreover, we show how the factorization method, pioneered by Eskin and Mirzakhani in their groundbreaking work about measure rigidity for the moduli space of translation surfaces, can be adapted to smooth ergodic theory and in particular towards the study of Anosov flows.

2020
Jan
09

12:00pm to 1:00pm

Manchester Building, Room 209

January 9, 12:00-13:00, Seminar room 209, Manchester building.

2019
Dec
18

11:00am to 1:00pm

Ross building - Room 63

2019
Dec
18

2:30pm to 3:30pm

221B

Title: Spherical spin glass models

Abstract: In the 70s, physicists proposed several models fordisordered magnetic alloys called spin glass models. Mathematically, thespherical models are random functions on the sphere in high-dimensions, andmany of the questions physicists are interested in can be phrased aspurely mathematical questions about geometric properties, extreme values,critical points, and Gibbs measures of random functions and the interplaybetween them.

- Events & Seminars
- Colloquium
- Analysis
- Amitsur Algebra
- Basic Notions
- Combinatorics
- Dynamics Lunch
- Dynamical & Probability
- Game Theory & Mathematical Economics
- Graduate Students Seminar
- Groups & Dynamics
- HD-Combinatorics
- HUJI-BGU AGNT Seminar
- Kazhdan Sunday Seminars
- Number Theory & Algebraic Geometry
- Logic
- Set Theory
- Special Lectures
- Topology & Geometry

- Eshnav
- Conferences & special events