Upcoming

All upcoming events

Midrasha on Groups Seminar

Date:
01
Monday
December
2025
Lecture / Seminar
Time: 11:15-13:00
Title: Building metrics on groups and the Gleason–Yamabe theorem II
Location: The David Lopatie Hall of Graduate Studies
Lecturer: Guy Kapon
Organizer: Faculty of Mathematics and Computer Science
Contact: hany.kochavi@weizmann.ac.il
Abstract: I will mostly follow pages 112–123 in Terrence Tao’s book. ... Read more I will mostly follow pages 112–123 in Terrence Tao’s book.
Close abstract

Midrasha on Groups Seminar

Date:
01
Monday
December
2025
Lecture / Seminar
Time: 14:15-16:00
Title: Asymptotically commuting measures share the Furstenberg–Poisson boundary
Location: The David Lopatie Hall of Graduate Studies
Lecturer: Aranka Hrušková
Organizer: Faculty of Mathematics and Computer Science
Contact: hany.kochavi@weizmann.ac.il
Abstract: Let \theta and \mu be two Borel probability measures on a topological group G su ... Read more Let \theta and \mu be two Borel probability measures on a topological group G such that the subsemigroup generated by the support of \theta is contained in the subsemigroup generated by the support of \mu. We show that if the total variation distance of \theta\mu^n and \mu^n\theta, where the multiplication is understood to be convolution, goes to 0 as n tends to infinity, then every bounded \mu-harmonic function on G is also \theta-harmonic. Among other things, this result gives elegant alternative proofs of several known theorems, for example that for any probability measure \nu on G, the centre of G acts trivially on the Poisson boundary of (G,\nu). Joint work with Yair Hartman and Omer Segev.
Close abstract

Geometric Functional Analysis and Probability Seminar

Date:
04
Thursday
December
2025
Lecture / Seminar
Time: 13:30-14:30
Title: Graph theory and scrambling of quantum information
Location: Jacob Ziskind Building
Lecturer: Uzy Smilansky
Organizer: Faculty of Mathematics and Computer Science
Contact: hany.kochavi@weizmann.ac.il

Geometric Functional Analysis and Probability Seminar

Date:
11
Thursday
December
2025
Lecture / Seminar
Time: 13:30-14:30
Title: TBD
Location: Jacob Ziskind Building
Lecturer: Roee Leder
Organizer: Faculty of Mathematics and Computer Science
Contact: hany.kochavi@weizmann.ac.il

Geometric Functional Analysis and Probability Seminar

Date:
18
Thursday
December
2025
Lecture / Seminar
Time: 13:30-14:30
Title: TBD
Location: Jacob Ziskind Building
Lecturer: Assaf Naor
Organizer: Faculty of Mathematics and Computer Science
Contact: hany.kochavi@weizmann.ac.il

Geometric Functional Analysis and Probability Seminar

Date:
25
Thursday
December
2025
Lecture / Seminar
Time: 13:30-14:30
Title: TBD
Location: Jacob Ziskind Building
Lecturer: Yeor Hafouta
Organizer: Faculty of Mathematics and Computer Science
Contact: hany.kochavi@weizmann.ac.il

Geometric Functional Analysis and Probability Seminar

Date:
01
Thursday
January
2026
Lecture / Seminar
Time: 13:30-14:30
Title: TBD
Location: Jacob Ziskind Building
Lecturer: Eyal Lubetzky
Organizer: Faculty of Mathematics and Computer Science
Contact: hany.kochavi@weizmann.ac.il

Geometric Functional Analysis and Probability Seminar

Date:
08
Thursday
January
2026
Lecture / Seminar
Time: 13:30-14:30
Title: TBD
Location: Jacob Ziskind Building
Lecturer: Adva Mond
Organizer: Faculty of Mathematics and Computer Science
Contact: hany.kochavi@weizmann.ac.il

Geometric Functional Analysis and Probability Seminar

Date:
15
Thursday
January
2026
Lecture / Seminar
Time: 13:30-14:30
Title: TBD
Location: Jacob Ziskind Building
Lecturer: Zhenhao Ca
Organizer: Faculty of Mathematics and Computer Science
Contact: hany.kochavi@weizmann.ac.il

Geometric Functional Analysis and Probability Seminar

Date:
22
Thursday
January
2026
Lecture / Seminar
Time: 13:30-14:30
Title: TBD
Location: Jacob Ziskind Building
Lecturer: Elliot Paquette
Organizer: Faculty of Mathematics and Computer Science
Contact: hany.kochavi@weizmann.ac.il

    Past

    All years202520232017

    All Events

    Geometric Functional Analysis and Probability Seminar

    Date:
    27
    Thursday
    November
    2025
    Lecture / Seminar
    Time: 13:30-14:30
    Title: Inhomogeneous and log-concave random matrices, and efficient sphere discretization
    Location: Jacob Ziskind Building
    Lecturer: Galyna Livshyts
    Organizer: Faculty of Mathematics and Computer Science
    Contact: hany.kochavi@weizmann.ac.il
    Abstract: How likely is a random matrix to be invertible? This fundamental question is int ... Read more How likely is a random matrix to be invertible? This fundamental question is intimately related to the question of estimating the smallest singular value of the random matrix. We discuss sharp estimates for the smallest singular value in the case of two novel ensembles of random matrices: inhomogeneous random matrices (whose entries are independent, but the variance profile is fairly general), and log-concave isotropic random matrices. When it comes to the latter, we will witness an exciting general phenomenon: convexity can replace independence in the study of universality in high dimensions. One important tool that we develop is an efficient discretization procedure of the sphere in high dimensions.We will flash out the entertaining proof of this result. The talk will be based on three papers, two of which are joint with others: one with Tikhomirov and Vershynin, and another with Fernandez and Mui.
    Close abstract

    Geometric Functional Analysis and Probability Seminar

    Date:
    20
    Thursday
    November
    2025
    Lecture / Seminar
    Time: 13:30-14:30
    Title: Tilings and Cluster Algebras for the Amplituhedron
    Location: Jacob Ziskind Building
    Lecturer: Tsviqa Lakrec
    Organizer: Faculty of Mathematics and Computer Science
    Contact: hany.kochavi@weizmann.ac.il
    Abstract: In 2005, Britto, Cachazo, Feng and Witten (BCFW) gave a recursion relation for c ... Read more In 2005, Britto, Cachazo, Feng and Witten (BCFW) gave a recursion relation for computing scattering amplitudes in N = 4 super Yang–Mills theory. In 2013, Golden, Goncharov, Spradlin, Vergu and Volovich discovered in the scattering amplitudes of this theory a cluster algebraic structure. The amplituhedron A(n,k,m) is a geometric object, introduced by Arkani-Hamed and Trnka in 2013, conjectured to encode scattering amplitudes in planar N = 4 super Yang–Mills. In this talk, I will discuss the amplituhedron and how both the aforementioned BCFW recursion and cluster algebra structures originate in its geometry. Based on joint works with Even-Zohar, Parisi, Sherman-Bennett, Tessler and Williams.
    Close abstract

    Midrasha on Groups Seminar

    Date:
    17
    Monday
    November
    2025
    Lecture / Seminar
    Time: 14:15-16:00
    Title: Haar measure, the Peter–Weyl theorem, and compact or abelian groups
    Location: The David Lopatie Hall of Graduate Studies
    Lecturer: Noam Baruch
    Organizer: Faculty of Mathematics and Computer Science
    Contact: hany.kochavi@weizmann.ac.il
    Abstract: I will mostly follow pages 73–97 in Terrence Tao’s book. ... Read more I will mostly follow pages 73–97 in Terrence Tao’s book.
    Close abstract

    Midrasha on Groups Seminar

    Date:
    17
    Monday
    November
    2025
    Lecture / Seminar
    Time: 11:15-13:00
    Title: Zimmer’s conjecture for lattices in p-adic groups
    Location: The David Lopatie Hall of Graduate Studies
    Lecturer: Segev Gonen Cohen
    Organizer: Faculty of Mathematics and Computer Science
    Contact: hany.kochavi@weizmann.ac.il
    Abstract: In the late 80s and early 90s Robert J. Zimmer conjectured a classification of t ... Read more In the late 80s and early 90s Robert J. Zimmer conjectured a classification of the possible actions of high rank lattices on compact manifolds (under suitable restrictions - on the action, or the underlying manifold). Recently many cases of the conjectures have been proven in the seminal work of Brown, Fisher, and Hurtado, including the full conjectures for SL(n,R) (for n > 2); I will present partial progress towards the conjecture for lattices in p-adic groups. In my talk I will recap a (biased) history of the results in this area, before explaining the key technical innovations that we employ.
    Close abstract

    Midrasha on Groups Seminar

    Date:
    03
    Monday
    November
    2025
    Lecture / Seminar
    Time: 14:15-16:00
    Title: Products of conjugacy classes
    Location: The David Lopatie Hall of Graduate Studies
    Lecturer: Nir Avni
    Organizer: Faculty of Mathematics and Computer Science
    Contact: hany.kochavi@weizmann.ac.il
    Abstract: For a group G and a normal (=conjugation invariant) subset A, let be the subgro ... Read more For a group G and a normal (=conjugation invariant) subset A, let be the subgroup generated by A, and let X_A be the Cayley graph of with generating set A.  I will talk about: 1) The diameter of X_A, in the case G is a higher rank lattice.  2) The mixing time of X_A, in case G is a compact simple Lie group.  3) Applications of the above.  Based on joint works and works in progress with Chen Meiri, Itay Glazer, Peter Keevash, Michael Larsen, and Noam Lifshitz.
    Close abstract

    Midrasha on Groups Seminar

    Date:
    03
    Monday
    November
    2025
    Lecture / Seminar
    Time: 11:15-13:00
    Title: Lie groups, Lie algebras, and the Baker–Campbell–Hausdorff formula
    Location: The David Lopatie Hall of Graduate Studies
    Lecturer: Yotam Shomroni
    Organizer: Faculty of Mathematics and Computer Science
    Contact: hany.kochavi@weizmann.ac.il
    Abstract: I will introduce the analytic structure theory of Lie groups through their conne ... Read more I will introduce the analytic structure theory of Lie groups through their connection with Lie algebras, which capture the infinitesimal behavior of the group. We will explore how the exponential map and the Baker–Campbell–Hausdorff formula bridge the two, leading to key insights such as the local-to-global correspondence and automatic analyticity of Lie groups. I will mostly follow pages 25–51 in Terrence Tao’s book.
    Close abstract

    Winter STAR workshop 2023

    Date:
    29
    Sunday
    January
    2023
    -
    03
    Friday
    February
    2023
    Lecture / Seminar
    Time: 00:00
    Organizer: Faculty of Mathematics and Computer Science
    Winter STAR workshop 2023 Lecture / Seminar website

    Faculty Summer Event

    Date:
    14
    Thursday
    September
    2017
    Retreat
    Time: 18:30-22:00
    Location: Campus Recreation Center
    Organizer: Faculty of Mathematics and Computer Science
    Contact: alona.sandler@weizmann.ac.il

    Example 1 for internal event node

    Date:
    08
    Monday
    May
    2017
    -
    10
    Wednesday
    May
    2017
    Retreat
    Time: 10:00 - 12:30
    Location: David Lopatie Conference Centre ...
    Organizer: Department of ...
    Contact: weizmann@weizmann.ac.il

    Example 2 for internal event node

    Date:
    08
    Monday
    May
    2017
    -
    10
    Wednesday
    May
    2017
    Retreat
    Time: 10:00 - 12:30
    Location: David Lopatie Conference Centre ...
    Organizer: Department of ...
    Contact: weizmann@weizmann.ac.il