# Eventss

# NT & AG Seminar "A dream desingularization algorithm", Michael Temkin

# Landau Lecture 3: Liftings mod p2 and the Nygaard filtration

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Liftings mod p^{2} and the Nygaard filtration

__Abstract__: I will revisit old results on liftings mod p^{2} and decompositions of de Rham complexes in positive characteristic (Deligne-I.) at the light of relations recently discovered independently by Bhargav Bhatt and myself between cotangent complexes, de Rham-Witt, and derived de Rham complexes.

# Annual conference of the Israel Mathematical Union 2019

### Program and Schedule (IMU website)

- Plenary morning session - Manchester Building, Hall 2.
- Parallel afternoon sessions - Sprinzak Building.
- Poster session - The Israel Institute for Advanced Studies building lobby.

Read more about Annual conference of the Israel Mathematical Union 2019

# Groups & dynamics seminar: Noam Kolodner (HUJI) - Surjectivity of morphisms of labeled core-graph under the action of automorphisms of a free group

# Groups and dynamics seminar - Yoav Gat (Technion) - Counting lattice points on the Heisenberg groups - A generalization of a classical problem to a non-commutative setting

# No seminar (IMU annual meeting)

# Tzafriri lecture: Amir Algom - A simultaneous version of Host's equidistribution Theorem

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# NT & AG Lunch: Yakov Varshavsky "Geometric class field theory"

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field theory has a simple geometric interpretation and a conceptual proof. We will only consider the unramified case (see, for example, https://arxiv.org/pdf/1507.00104.pdf or https://dspace.library.uu.nl/handle/1874/206061)

Key words: Abel-Jacobi map, l-adic sheaves, sheaf-function correspondence.

# NT & AG Lunch: Yakov Varshavsky "Geometric class field theory, II"

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Geometric class field theory is an analog of the classical class field theory over function fields in which functions are replaced by sheaves. In the first part of my talk, I will formulate the result and explain its proof over C (the field of complex numbers).

In the second part of the talk, I will try to outline the proof in the case of finite fields and indicate how this result implies the classical unramified global class field theory over function fields.

Most of the talk will be independent of the first one.

# Dynamics Lunch: Matan Tal " Construction of a random walk on a lattice that is asymptotically appropriate for the ambient group (SLn(R))."

# Landau Lecture 2: Old and new on the de Rham-Witt complex (NT - AG Seminar)

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### Old and new on the de Rham-Witt complex

__Abstract__: After reviewing the definition and the basic properties of the de Rham-Witt complex for smooth schemes over a perfect field, I will discuss the new approach to the subject developed by Bhatt, Lurie and Mathew.

I will explain the main results and sketch work in progress on the problems raised by this theory.