2019
Mar
20

# Logic Seminar - Spencer Unger

11:00am to 1:00pm

## Location:

Ross 63

**Stationary reflection and the singular cardinals hypothesis.**

2019
Mar
20

11:00am to 1:00pm

Ross 63

2019
Jun
19

11:00am to 1:00pm

Ross 63

2019
May
29

2019
May
01

2019
Mar
18

Repeats every week every Monday until Mon Apr 29 2019 except Mon Apr 22 2019.

4:00pm to 6:00pm4:00pm to 6:00pm

4:00pm to 6:00pm

4:00pm to 6:00pm

4:00pm to 6:00pm

4:00pm to 6:00pm

Ross 70

Abstract. This is a joint work with Linhui Shen.

A decorated surface is an oriented surface with punctures and a finite collection of special points on the boundary, considered modulo isotopy.

Let G be a split adjoint group. We introduce a moduli space Loc(G,S) of G-local systems on a decorated surface S, which reduces to the character variety when S has no boundary, and quantize it.

2019
Mar
18

1:00pm to 2:00pm

Faculty lounge, Math building

Class field theory classifies abelian extensions of local and global fields

in terms of groups constructed from the base. We shall survey the main results of class

field theory for number fields and function fields alike. The goal of these introductory lectures

is to prepare the ground for the study of explicit class field theory in the function field case,

via Drinfeld modules.

I will talk for the first 2 or 3 times.

in terms of groups constructed from the base. We shall survey the main results of class

field theory for number fields and function fields alike. The goal of these introductory lectures

is to prepare the ground for the study of explicit class field theory in the function field case,

via Drinfeld modules.

I will talk for the first 2 or 3 times.

2019
Apr
02

2019
Mar
18

2:30pm to 3:30pm

Room 70A, Ross Building, Jerusalem, Israel

There is a general slogan according to which the limit behaviour of a one-parameter family of complex algebraic varieties when the parameter t tends to zero should be (partially) encoded in the associated t-adic analytic space in the sense of Berkovich; this slogan has given rise to deep and fascinating conjecturs by Konsevich and Soibelman, as well as positive results by various authors (Berkovich, Nicaise, Boucksom, Jonsson...).

2019
Mar
13

2019
May
22

2:00pm to 3:30pm

Ross 63

Abstract: We combine a technique of Steel with one due to Jensen and Steel to

obtain a core model below singular cardinals kappa which are

sufficiently closed under the beth function, assuming that there is no

premouse of height kappa with unboundedly many Woodin cardinals.

The motivation for isolating such core model is computing a lower bound for the strength of

the theory: T = ''ZFC + there is a singular cardinal kappa such that the set of ordinals below kappa where GCH holds is stationary and co-stationary''.

obtain a core model below singular cardinals kappa which are

sufficiently closed under the beth function, assuming that there is no

premouse of height kappa with unboundedly many Woodin cardinals.

The motivation for isolating such core model is computing a lower bound for the strength of

the theory: T = ''ZFC + there is a singular cardinal kappa such that the set of ordinals below kappa where GCH holds is stationary and co-stationary''.

2019
May
15

2:00pm to 3:30pm

Ross 63

Abstract: We combine a technique of Steel with one due to Jensen and Steel to

obtain a core model below singular cardinals kappa which are

sufficiently closed under the beth function, assuming that there is no

premouse of height kappa with unboundedly many Woodin cardinals.

The motivation for isolating such core model is computing a lower bound for the strength of

the theory: T = ''ZFC + there is a singular cardinal kappa such that the set of ordinals below kappa where GCH holds is stationary and co-stationary''.

obtain a core model below singular cardinals kappa which are

sufficiently closed under the beth function, assuming that there is no

premouse of height kappa with unboundedly many Woodin cardinals.

The motivation for isolating such core model is computing a lower bound for the strength of

the theory: T = ''ZFC + there is a singular cardinal kappa such that the set of ordinals below kappa where GCH holds is stationary and co-stationary''.

2019
Mar
12

1:00pm to 2:30pm

Room 110, Manchester Building, Jerusalem, Israel

I will discuss results relating different partially wrapped Fukaya categories. These include a K\"unneth formula, a `stop removal' result relating partially wrapped Fukaya categories relative to different stops, and a gluing formula for wrapped Fukaya categories. The techniques also lead to generation results for Weinstein manifolds and for Lefschetz fibrations. The methods are mainly geometric, and the key underlying Floer theoretic fact is an exact triangle in the Fukaya category associated to Lagrangian surgery along a short Reeb chord at infinity.

2019
Jun
17

11:00am to 1:00pm

U. Haifa

From Raphy Yuster: On Monday 17 June, 2019 we will hold a one day mini conference in memory of Professor Yossi Zaks

(see attached poster or updated information in

http://sciences.haifa.ac.il/math/wp/?page_id=1382 )

Mini conference: Yossi Zaks Memorial Meeting – Monday, June 17, 2019

list of speakers

Noga Alon, Princeton University and Tel Aviv University

Gil Kalai, Hebrew University

Nati Linial, Hebrew University

Rom Pinchasi, The Technion

Organizers

2019
Apr
29

11:00am to 1:00pm

CS B-500, Safra campus

Speaker: Karthik C. Srikanta (Weizmann Institute)

Title: On Closest Pair Problem and Contact Dimension of a Graph

Abstract: Given a set of points in a metric space, the Closest Pair problem asks to find a pair of distinct points in the set with the smallest distance. In this talk, we address the fine-grained complexity of this problem which has been of recent interest. At the heart of all our proofs is the construction of a family of dense bipartite graphs with special embedding properties and are inspired by the construction of locally dense codes.

Title: On Closest Pair Problem and Contact Dimension of a Graph

Abstract: Given a set of points in a metric space, the Closest Pair problem asks to find a pair of distinct points in the set with the smallest distance. In this talk, we address the fine-grained complexity of this problem which has been of recent interest. At the heart of all our proofs is the construction of a family of dense bipartite graphs with special embedding properties and are inspired by the construction of locally dense codes.

2019
Apr
08

11:00am to 1:00pm

CS B-500, Safra campus

Speaker: Kim Minki, Technion

Title: The fractional Helly properties for families of non-empty sets

Abstract:

Let $F$ be a (possibly infinite) family of non-empty sets.

The Helly number of $F$ is defined as the greatest integer $m = h(F)$ for which there exists a finite subfamily $F'$ of cardinality $m$ such that every proper subfamily of $F'$ is intersecing and $F'$ itself is not intersecting.

For example, Helly's theorem asserts that the family of all convex sets in $d$-dimensional Euclidean space has Helly number $d+1$.

Title: The fractional Helly properties for families of non-empty sets

Abstract:

Let $F$ be a (possibly infinite) family of non-empty sets.

The Helly number of $F$ is defined as the greatest integer $m = h(F)$ for which there exists a finite subfamily $F'$ of cardinality $m$ such that every proper subfamily of $F'$ is intersecing and $F'$ itself is not intersecting.

For example, Helly's theorem asserts that the family of all convex sets in $d$-dimensional Euclidean space has Helly number $d+1$.