Upcoming seminars can also be found here.

2020
May
06

Upcoming seminars can also be found here.

2020
May
06

2020
May
20

2020
Mar
19

4:00pm to 5:15pm

Ross 70

Abstract.I will outline some results in Algebraic Geometry obtained in our works withT.Ziegler. Our proofs are based on Analysis over finite fields which leads tonew results even for complex varieties.

2020
Mar
26

4:00pm to 5:15pm

Ross 70

Abstract.I will outline some results in Algebraic Geometry obtained in our works withT.Ziegler. Our proofs are based on Analysis over finite fields which leads tonew results even for complex varieties.

2020
Feb
25

2:00pm to 4:00pm

Ross building - Room 63,

Title: Classification of imaginaries in valued fields with automorphism

valued fields are classified by the so-called 'geometric' sorts. This is a fundamental

result due to Haskell-Hrushovski-Macpherson. We show that the imaginaries in

henselian equicharacteristic 0 valued fields may be reduced, under rather general

2020
Mar
24

2:00pm to 3:00pm

2020
Mar
26

10:00am to 11:00am

2020
Mar
26

12:00pm to 1:00pm

Seminar room 209, Manchester Building, Jerusalem, Israel.

The question of `how do algebras grow?', or, which functions can be realized as growth functions of algebras (associative/Lie, or algebras having certain additional algebraic properties) is a major problem in the meeting point of several mathematical fields including algebra, combinatorics, symbolic dynamics and more.

2020
Apr
22

2020
Mar
25

2020
Jun
03

2020
Jan
29

9:45am to 11:45am

Ross building - Room 63

Title: Coloring Stable Graphs

map c:V\to \kappa in which adjacent vertices are colored in different

colors. The chromatic number of G is the smallest such \kappa.

We will briefly review some questions and conjectures on the chromatic

number of infinite graphs and will mainly concentrate on the strong

form of Taylor's conjecture:

2020
Jan
26

2020
Jan
22

11:00am to 1:00pm

Ross building - Room 63

Abraham Robinson characterized the existentially closed valued fields as those which are algebraically closed and nontrivially valued. This theorem is somewhat surprising: it makes no assumption on the topology of the field other than the fact that it is not discrete, and immediately implies a strong from of the Nullstellensatz, asserting that the only obstruction to the solvability of a system of polynomial equations in a neighborhood of a point is the obvious one.

2020
Jan
30

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.