2018 Nov 14

# Set Theory Seminar: Shimon Garti "On the consistency of d_lambda > r_lambda for a singular cardinal lambda"

2:00pm to 3:30pm

## Location:

Ross 63
Abstract: We shall try to prove the consistency of d_lambda > r_lambda (and even d_lambda > u_lambda) for a singular cardinal lambda. This is a joint work with Saharon.
2018 Nov 05

# NT&AG: Michael Temkin (HUJI), ""Differential forms on Berkovich curves"

3:00pm to 4:00pm

## Location:

Room 70A, Ross Building, Jerusalem, Israel
This is a continuation of the talk on October 29. After finishing a brief review of basic facts about Berkovich curves, I will associate a reduction datum to differential forms on such curves and explain how a lifting theorem for such data is proved and why it reproves the lifting theorem of [BCGGM].
2018 Oct 31

# Logic Seminar - Yatir Halevi

11:00am to 1:00pm

## Location:

Ross 63

Around the stable and dependent fields conjecture

Abstract: The stable fields conjecture asserts that every infinite stable field is separably closed.
We will talk a bit about the history of this conjecture, its connection to an analogous conjecture on dependent fields and some of their consequences.
Finally, we will end by proving the conjecture for fields of finite dp-rank.
2019 Jan 14

# Combinatorics: Frank Mousset, TAU, "The upper tail for triangles in sparse random graphs"

11:00am to 1:00pm

## Location:

Rothberg CS bldg, room B500, Safra campus, Givat Ram
Speaker: Frank Mousset, TAU Title: The upper tail for triangles in sparse random graphs Abstract:
2018 Dec 19

2:00pm to 3:30pm

Ross 63
2018 Oct 31

2:00pm to 3:29pm

2018 Oct 29

# NT&AG: Michael Temkin (HUJI), ""Differential forms on Berkovich curves"

2:30pm to 3:30pm

## Location:

Room 70A, Ross Building, Jerusalem, Israel
The moduli space of smooth curves with a chosen differential form has a natural stratification by the pattern of zeros of the form. In a recent paper of Bainbridge-Chen-Gendron-Grushevsky-Moeller, one used a complicated complex-analytic technique to explicitly describe a compactification of these strata. In a joint work in progress with I. Tyomkin we provide an algebraic proof of these results based on studying differential forms on Berkovich curves over fields of residual characteristic zero.
2018 Oct 24

# Set Theory Seminar (Ross 63)

2:00pm to 3:30pm

## Location:

Ross 63
לאירוע הזה יש שיחת וידאו. הצטרף: https://meet.google.com/bbc-knox-fds +1 225-434-0384 קוד גישה: 826117698#
2018 Dec 18

# Dynamics Lunch: Omer Ben-Neria

12:00pm to 1:00pm

2018 Nov 06

# Jon Aaronson (TAU) On the bounded cohomology of actions of multidimensional groups.

2:15pm to 3:15pm

Although each cocycle for a action of the integers is specified by the sequence of Birkhoff sums of a function, it is relatively difficult to specify cocycles for the actions of multidimensional groups such as $\Bbb Z^2$. We'll see that if $(X,T)$ is a transitive action of the finitely generated (countable) group $\Gamma$ by homeomorphism of the polish space $X$, and $\Bbb B$ is a separable Banach space, there is a cocycle $F:\Gamma\times X \to\Bbb B$ with each $x\mapsto F(g,x)$ bounded and continuous so that the skew product action $(X x \Bbb B,S)$ is transitive where
2018 Nov 25

# Kazhdan seminar: Tomer Schlank "The Nonabelian Chabauty Method"

12:00pm to 2:00pm

## Location:

Ross 70A
Abstract: 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 Dec 09

# Kazhdan seminar: Karim Adiprasito "Positivity in combinatorics and beyond"

3:00pm to 5:00pm

## Location:

Ross 70A
Abstract: 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
2018 Oct 21

# Kazhdan seminar: Karim Adiprasito "Positivity in combinatorics and beyond"

3:00pm to 5:00pm

## Location:

Ross 70A
Abstract: 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
2018 Dec 16

# Kazhdan seminar: Tomer Schlank "The Nonabelian Chabauty Method"

12:00pm to 2:00pm

## Location:

Ross 70A
Abstract: 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 Dec 23

# Kazhdan seminar: Karim Adiprasito "Positivity in combinatorics and beyond"

3:00pm to 5:00pm

## Location:

Ross 70A
Abstract: 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