# Techmath - Math Seminars in Israel

*Abstract:*

Rademacher's Theorem asserts that a real-valued Lipschitz function on a Euclidean space is differentiable almost everywhere with respect to the Lebesgue measure, so that any set of positive measure captures points of differentiability of every Lipschitz function on the space. It turns out that this can be improved significantly when we consider differentiability of typical 1-Lipschitz functions. However, instead of simply looking at the Lebesgue measure, we need to employ notions from geometric measure theory. Namely, we show that sets which can be covered by a countable union of closed purely unrectifiable sets are exactly those for which a typical 1-Lipschitz function has no directional derivatives at any point of the set. Sets which cannot be so covered are exactly those on which a typical 1-Lipschitz function is differentiable at some point. Here "typical" means that the complement is a meagre set, that is, a set of 1st Baire category. This is joint work with Michael Dymond.

*Announcement:*

You are invited to the 2019 Summer School:

**Into the forest: group actions on trees and generalizations**

*July 28 – August 1, 2019*

**There will be 5 mini-courses, given by:**

- Indira Chatterji (UNSA)
- Bruno Duchesne (IECL)
- Mark Hagen (UoB)
- Arnaud Hilion (AMU)
- Michah Sageev (Technion)

**Organizer**: Nir Lazarovich

*Abstract:*

Dear Colleagues, The Center for Advanced Studies in Mathematics The Earl Katz Family Chair in Pure Mathematics cordially invite you to THE 9TH ALGEBRA AND NUMBER THEORY DAY taking place 8 August, 2019 at Ben Gurion University 11:00-11:10 Greetings 11:10-12:00 Eliyahu Matzri (Bar-Ilan) "Higher triple Massey products" 12:10-13:00 David Corwin (UC Berkeley) “Local-Global Principles for Diophantine Equations and Topology” 13:00-14:00 Lunch 14:10-15:00 Stefan Wewers (Ulm) “Semistable reduction and local Galois representation for curves” 15:10-16:00 Magnus Carlson (HUJI) “Arithmetic field theories” The lectures will take place at the Deichman Building of Mathmatics (58), room -101 (basement floor) If you wish to take part, please register by sending an email to the organizers at algebranumbertheorybgu@gmail.com Organizers: Ishai Dan-Cohen and Ido Efrat Sincerely, The organizers

*Announcement:*

**MATH RESEARCH PROJECTS**

**Technion, September 22-26, 2019**

The Mathematics faculty at the Technion is inviting motivated undergraduate students (finishing their 2^{nd} and 3^{rd} year*) to experience research level mathematics in a week of projects. The projects will be mentored by professors and postdocs from the Faculty of Mathematics. Each group will consist of 2-4 students working on the same research topic. In addition, the program includes social gatherings with the faculty members. Housing, meals, and a stipend will be provided.

**For more information click here**

**פרויקטי מחקר במתמטיקה**

** טכניון , 22-26 בספטמברת 2019**

הפקולטה למתמטיקה בטכניון מזמינה סטודנטים לתואר ראשון (המסיימים את השנה השנייה או השלישית של התואר*) לחוויית מחקר מתמטי מתקדם בשבוע של פרויקטים. הפרויקטים יונחו על-ידי פרופסורים, פוסטדוקים וסטודנטים בתארים מתקדמים מהפקולטה למתמטיקה.

כל קבוצה תכיל 2-4 סטודנטים שיחקרו נושא משותף. בנוסף לפרויקטים התוכנית תכלול הרצאות מתמטיות ואירועים חברתיים יחד עם סגל הפקולטה. לינה, ארוחות ומלגת קיום יסופקו על-ידי התכנית.

*Announcement:*

You are invited to a:

** Distinguished Lecture Series by**

**Prof. David Jerison (MIT)**

**Titles and abstracts**: *TBA*

**1st lecture**: Monday, November 25, 2019 at 15:30

**2nd lecture**: Wednesday, November 27, 2019 at 15:30

**3rd lecture**: Thursday, November 28, 2019 at 15:30

All lectures will be in Amado 232.

Light refreshments will be given in the faculty lounge on the 8th floor.

*Announcement:*

You are invited to a:

** Distinguished Lecture Series by**

**Prof. David Jerison (MIT)**

**Titles and abstracts**: *TBA*

**1st lecture**: Monday, November 25, 2019 at 15:30

**2nd lecture**: Wednesday, November 27, 2019 at 15:30

**3rd lecture**: Thursday, November 28, 2019 at 15:30

All lectures will be in Amado 232.

Light refreshments will be given in the faculty lounge on the 8th floor.

*Announcement:*

You are invited to a:

** Distinguished Lecture Series by**

**Prof. David Jerison (MIT)**

**Titles and abstracts**: *TBA*

**1st lecture**: Monday, November 25, 2019 at 15:30

**2nd lecture**: Wednesday, November 27, 2019 at 15:30

**3rd lecture**: Thursday, November 28, 2019 at 15:30

All lectures will be in Amado 232.

Light refreshments will be given in the faculty lounge on the 8th floor.

*Announcement:*

You are invited to a:

** Special Lecture Series by**

**Prof. Darren Crowdy**

**Imperial College London**

**Titles and abstracts**: *TBA*

**1st lecture**: Monday, December 2, 2019 at 15:30

**2nd lecture**: Wednesday, December 4, 2019 at 15:30

**3rd lecture**: Thursday, December 5, 2019 at 15:30

All lectures will be in Amado 232.

Light refreshments will be given in the faculty lounge on the 8th floor.

*Announcement:*

You are invited to a:

** Special Lecture Series by**

**Prof. Darren Crowdy**

**Imperial College London**

**Titles and abstracts**: *TBA*

**1st lecture**: Monday, December 2, 2019 at 15:30

**2nd lecture**: Wednesday, December 4, 2019 at 15:30

**3rd lecture**: Thursday, December 5, 2019 at 15:30

All lectures will be in Amado 232.

Light refreshments will be given in the faculty lounge on the 8th floor.

*Announcement:*

You are invited to a:

** Special Lecture Series by**

**Prof. Darren Crowdy**

**Imperial College London**

**Titles and abstracts**: *TBA*

**1st lecture**: Monday, December 2, 2019 at 15:30

**2nd lecture**: Wednesday, December 4, 2019 at 15:30

**3rd lecture**: Thursday, December 5, 2019 at 15:30

All lectures will be in Amado 232.

Light refreshments will be given in the faculty lounge on the 8th floor.

*Abstract:*

You are invited to a:

** Distinguished Lecture Series by**

**Prof. Sergei Tabachnikov**

**(Pennsylvania State University)**

**Titles and abstracts**: *TBA*

**1st lecture**: Monday, January 6, 2020 at 15:30

**2nd lecture**: Wednesday, January 8, 2020 at 15:30

**3rd lecture**: Thursday, January 9, 2020 at 15:30

All lectures will be in Amado 232.

Light refreshments will be given in the faculty lounge on the 8th floor.

*Announcement:*

You are invited to a:

** Distinguished Lecture Series by**

**Prof. Sergei Tabachnikov**

**Pennsylvania State University **

**Titles and abstracts**: *TBA*

**1st lecture**: Monday, January 6, 2020 at 15:30

**2nd lecture**: Wednesday, January 8, 2020 at 15:30

**3rd lecture**: Thursday, January 9, 2020 at 15:30

All lectures will be in Amado 232.

Light refreshments will be given in the faculty lounge on the 8th floor.

*Announcement:*

You are invited to a:

** Distinguished Lecture Series by**

**Prof. Sergei Tabachnikov**

**Pennsylvania State University **

**Titles and abstracts**: *TBA*

**1st lecture**: Monday, January 6, 2020 at 15:30

**2nd lecture**: Wednesday, January 8, 2020 at 15:30

**3rd lecture**: Thursday, January 9, 2020 at 15:30

All lectures will be in Amado 232.

Light refreshments will be given in the faculty lounge on the 8th floor.