# Category Archives: Birthday

## Simon Thomas: the first 60 years, Rutgers, September 15-17, 2017

The conference Simon Thomas: the first 60 years will take place this September 15–17 at Rutgers University, New Brunswick, New Jersey.

List of speakers

• Clinton Conley
• Ilijas Farah
• Matt Foreman
• Alekos Kechris
• Justin Moore
• Andrew Marks
• Itay Neeman
• Anush Tserunyan
• Robin Tucker-Drob
• Saharon Shelah
• Hugh Woodin (canceled)

Organizer
Grigor Sargsyan

1. Schedule.

Each talk is 50 minutes with 10 minutes devoted to questions and extras.

Day 1. Friday September 15.

All Friday talks will take place in Hill 705.

9:00am–10:00am Saharon Shelah (Jerusalem, Rutgers)
Title: ZFC constructing somewhat free Abelian group with prescribed endomorphism ring

10:30am-11:30am Robin Tucker-Drob (Texas A&M)
Title: Invariant means and lattices in totally disconnected locally compact groups

2:30pm–3:30pm Clinton Conley (CMU)
Title: Borel, mu-measurable, and Baire measurable matchings.

4:00pm–5:00pm Matthew Foreman, cross listed as the colloquium talk. (UCI)
Title: Classifying diffeomorphisms of surfaces
Abstract: In 1932, von Neumann proposed classifying the statistical behavior of diffeomorphisms of manifolds. In modern language this means classifying diffeomorphisms that preserve a smooth volume element up to measure theoretic isomorphism. Despite important progress using entropy and spectral invariants, the general problem remained open. This talk proves that a complete classification is impossible in a rigorous sense—even on compact surfaces. The proof of the theorem involves producing new examples of diffeomorphisms with strong structural properties such as high distal rank.

5:10pm–6:00pm (Special Talk) Francis Urquhart (Rutgers)
Title: The classification problem of FU groups is positively complex.

Day 2. Saturday September 16.

All Saturday talks will take place at Rutgers Conference Center.

9:00am–10am Itay Neeman (UCLA)
Title: Embedding theorem and regularity properties under $AD^+$
Abstract: We present an absoluteness theorem under $AD^+$, showing approximately that proper forcing extensions of sufficiently elementary countable submodels can be embedded back into the universe. We use this embedding theorem to prove, under $AD^+$, that all sets of reals have the Ramsey property, and in fact are $H$-Ramsey for every happy family $H$. This in particular implies that there are no infinite MAD families under $AD^+$. We also use the embedding theorem to prove, again under $AD^+$, that for any equivalence relation $E$ whose equivalence classes belong to a pointclass $\Gamma$ closed under Borel substitutions (respectively to $\Gamma\cap\check{\Gamma}$), and any nice enough $\sigma$-ideal $I$ on $\omega^\omega$, there are $I$-positive sets $C$ so that $E\restriction C$ belongs to $\Gamma$ (respectively $\Gamma\cap\check{\Gamma}$). This is joint work with Zach Norwood. The embedding theorem extends a result of Neeman-Zapletal. The application to mad families extends a result of Tornquist restoring methods of Mathias. The application to equivalence relations extends results of Chan-Magidor.

10:30am–11:30am Anush Tserunyan (Urbana)
Title: Hyperfinite ergodic subgraphs
Abstract: Using the work of Hutchcroft and Nachmias on indistinguishability of the Wired Uniform Spanning Forest, R. Tucker-Drob proved a powerful theorem last year: any probability measure preserving (p.m.p.) locally countable ergodic Borel graph admits an ergodic hyperfinite subgraph. By completely different and purely descriptive set theoretic methods, we prove this theorem without the p.m.p. requirement, thus obtaining the following generalization: any locally countable ergodic Borel graph on a standard probability space admits an ergodic hyperfinite subgraph. In this talk, we will discuss the main result and one or two new gadgets involved in the proof.

2:30pm–3:30pm Ilijas Farah (York)
Title: Approximately matricial C*-algebras Abstract: A unital C*-algebra A is AM (approximately matricial) if it is an inductive limit of a directed system of full matrix C*-algebras. Separable AM algebras were classified by Glimm (the equivalence relation is smooth) and they form the simplest nontrivial class of simple (no pun intended) C*-algebras, also known as the UHF (uniformly hyperfinite) C*-algebras. Some years ago it was proved by Katsura and myself that not every nonseparable AM algebra is UHF. I’ll talk about more recent interesting examples of AM algebras and the role of set theory in constructing them.

4:00pm-5:00pm Justin Moore (Cornell)
Title: Subgroups of Thompson’s group F

Day 3. Sunday September 17.

All Sunday talks will take place at Rutgers Conference Center.

9:30am–10:30am Aleksander Kechris (Caltech)
Title: Borel equivalence relations, cardinal algebras and structurability.
Abstract: The theory of Borel equivalence relations has been a very active area of research in descriptive set theory during the last 25 years. In this talk, I will discuss how Tarski’s concept of cardinal algebras, going back to the 1940’s, appears naturally in this theory and show how Tarski’s theory can be used to discover new laws concerning the structure of Borel equivalence relations, which, rather surprisingly, have not been realized before. In addition, I will discuss the concept of structurability for equivalence relations and explain some of its implications concerning the algebraic structure of the reducibility order among such equivalence relations. (This is joint work with H. Macdonald and R. Chen.)

11am–12pm Andrew Marks (UCLA)
Title: Martin’s measure and countable Borel equivalence relations
Abstract: Thomas has shown that Martin’s conjecture on Turing invariant functions would have a wealth of consequences for the structure of countable Borel equivalence relations. Many of these consequences derive from the strong ergodicity properties that the conjecture implies for Martin measure. We discuss some results related to Martin measure and countable Borel equivalence relations. This is joint work with Adam Day, and also Clinton Conley, Steve Jackson, Brandon Seward and Robin Tucker-Drob.

## Frontiers of Selection Principles, Warsaw, Aug 20 – Sep 1, 2017

The conference Frontiers of Selection Principles, celebrating the 60th birthday of Marion Scheepers will take place at the Dewajtis Campus, Bielanski forest, Warsaw, 20.8-1.9, 2017: 20.8-25.8 tutorial, 26.8 excursion, 27.8-1.9 conference. (This is immediately after the Logic Colloquium and immediately before the Bedlewo meeting on set theoretic topology and analysis.)

Selection principles connect topology, set theory, and functional analysis and make it possible to transport and apply methods from each of these fields to the other ones. It is now one of the most active streams of research within set theory and general topology. This conference will be fully dedicated to selection principles and their applications. It will begin with a one week tutorial, aimed mainly at students and researchers with no prior knowledge of selection principles. This tutorial will provide an overview of the filed, and a detailed introduction to its main methods. Participants with no prior knowledge attending the tutorial will thus fully benefit from the lectures of the second week, and will be able to consider possible directions for research in the field.

The second conference week will consist of invited lectures, by leading experts, on results in the frontiers of selection principles. We recommend that students and participants with expertise in other disciplines attend both weeks of the conference.

Initial details follow.

(Important: This is the only message distributed widely. Please email Piotr Szewczak (p.szewczak@wp.pl) to be included in the mailing list for details and updates.)

The expected accommodation cost is approximately 20EUR per night (full board: 30EUR).

Registration fee: Early registration: 50EUR. Normal registration: 80EUR. Registration fees will help reducing the costs for some students or early career researchers that would otherwise not be able to attend this meeting. Discount possibilities will be provided in future emails.

Tentative list of conference speakers:

Leandro Aurichi             Liljana Babinkostova                  Taras Banakh

Angello Bella*                Daniel Bernal Santos                  Maddalena Bonanzinga*

Lev Bukovsky                Steven Clontz*                           Samuel Da-Silva*

Rodrigo Dias                 Rafał Filipow                             David Gauld

Ondrej Kalenda              Ljubiša Kočinac*                        Adam Krawczyk

Adam Kwela                  Andrzej Nowik                           Selma Özçağ*

Yinhe Peng                   Szymon Plewik                          Robert Rałowski

Masami Sakai                Marion Scheepers                      Paul Szeptycki*

Piotr Szewczak              Franklin Tall                               Seçil Tokgöz

Boaz Tsaban                 Tomasz Weiss                           Lyubomyr Zdomskyy

Shuguo Zhnag               Ondrej Zindulka                         Szymon Żeberski

(* to be confirmed)

Subject to time constraints, students and other participants may have an opportunity to contribute a short lecture on a topic of selection principles.

Special request: Since a part of this workshop is especially accessible to students, we would appreciate your forwarding this message to your students and to other students who may be interested in attending this conference.

The conference is organized by Cardinal Stefan Wyszyński University in Warsaw.

On behalf of the organizing committee,

Piotr Szewczak (Cardinal Stefan Wyszynski University and Bar-Ilan University)

Boaz Tsaban (Bar-Ilan University)

Lyubomyr Zdomskyy (Kurt Gödel Research Center)

## Second announcement:

This festive conference is dedicated to selection principles, a growth area within set theory, topology, and functional analysis. It begins with a one-week tutorial (20-25 Aug) for students and researchers with no prior knowledge in the field, and continues to a week of conference lectures by experts (27 Aug-1 Sep).
Very attractive registration costs include full board accommodation, and early registration (by 30 Apr) is even cheaper. Early registrants may request (limited) financial support.
This conference takes place immediately after the Logic Colloquium and before the Będlewo meeting on set theoretic topology and analysis.
Visit the conference webpage and subscribe to its mailing list for additional details and updates.

# Set theory conference

## Aug 02–Aug 04, 2017

Organizers: Menachem Magidor (Jerusalem), Ralf Schindler (Münster), John Steel (Berkeley), W. Hugh Woodin (Harvard)

# Menachem Magidor 70th Birthday Conference

## The Hebrew University of Jerusalem, February 17-19 2016

Reigstration is now open!

### Invited speakers:

• Arthur Apter (CUNY)
• Joan Bagaria (ICREA & UB)
• James Cummings (CMU)
• Mirna Dzamonja (UEA)
• Ilijas Farah (York)
• Matthew Foreman (UCI)
• Moti Gitik (TAU)
• Juliette Kennedy (Helsinki)
• Peter Koepke (Bonn)
• Jean Larson (UFL)
• Bill Mitchell (UFL)
• Ralf Schindler (Münster)
• Saharon Shelah (HUJI)
• Dima Sinapova (UIC)
• John Steel (Berkeley)
• Jouko Väänänen (Helsinki & ILLC)
• Boban Velickovic (Paris 7)
• Matteo Viale (Torino)
• Philip Welch (Bristol)
• Hugh Woodin (Harvard)

## Workshop Theme

The objective of the programme Mathematical, Foundational and Computational Aspects of the Higher Infinite is to stimulate the exchange of ideas among researchers pursuing different approaches to infinity: mathematical, foundational, and computational.

Traditional set theory has been rather inwards-looking for many decades, dealing with the difficult and rewarding technical problems that the field provided. This has changed in the last decade, and set theorists have been eager to see the connections between their work and what is done in other fields of mathematics as well as outside of mathematics. Examples are the study of infinite games in the social sciences and theoretical computer science, the use of strong logics in data base theory, and the use of ideas from infinite combinatorial set theory in the design and analysis of efficient computer algorithms.

Our final workshop will highlight this network of applications of the higher infinite in mathematics and beyond.

As part of this meeting, we are also celebrating the 50th birthday of one of the three programme organisers, Mirna Dzamonja. During one afternoon of the workshop (organised together with Jouko Väänänen), we shall have a number of talks concerned with her work.

Invited speakers:

Dana Bartošova (São Paulo)
Nathan Bowler (Hamburg)
Andrew Brooke-Taylor (Bristol)
Catrin Campbell-Moore (Cambridge)
Merlin Carl (Konstanz)
Johannes Carmesin (Cambridge)
Olivier Finkel (Paris)
Martin Hyland (Cambridge)
Bob Lubarsky (Boca Raton FL)
Benjamin Miller (Vienna)
Michael Rathjen (Leeds)
Jiří Rosický (Brno)
Philippe Schnoebelen (Cachan)

Dzamonja afternoon speakers:

István Juhász (Budapest)
Jean Larson (Gainesville FL)
Menachem Magidor (Jerusalem)

## Arthur Apter & Moti Gitik’s 60th birthday meeting, CMU, May 30-31 2015

There will be a meeting at CMU May 30-31 2015 in honour of Arthur Apter and Moti  Gitik.

Speakers:

• Omer Ben-Neria
• Joel Hamkins
• Peter Koepke
• Menachem Magidor (canceled)
• Bill Mitchell
• Assaf Rinot
• Ralf-Dieter Schindler
• Dima Sinapova
• Hugh Woodin

# Timetable

## Saturday 30 May

8:45-9:30: Refreshments (Wean Hall 6220)

9:30-10:15: Assaf Rinot, “Putting a diamond inside the square”.

10:30-11:15: Ralf-Dieter Schindler, “Singular cardinals, pcf theory, and determinacy”.

11:15-11:45: Coffee break.

11:45-12:30: Dima Sinapova, “The SCH, square properties and Prikry forcing”.

12:30-2:30: Lunch.

3:30-4:15: Joel David Hamkins, “The weakly compact embedding property”.

4:15-4:45: Coffee break.

## Sunday 31 May

9:15-10:00: Refreshments (Wean Hall 6220)

10:00-10:45: Omer Ben-Neria, “The Possible Structure of the Mitchell Order”.

11:00-11:45: Peter Koepke, “Cardinal exponentiation without the axiom of choice”.

11:45-12:15: Coffee break

12:15-1:00: Hugh Woodin, “Ultimate-L”.

This meeting is partially supported by the Mid-Atlantic Mathematical Logic Seminar. Funding is available to support participant travel. See the conference web page for details.

## Conference in Honor of Hugh Woodin’s 60th Birthday

The meeting in honor of Hugh Woodin’s 60th birthday will be held on March 27-29, 2015, at Harvard University.

Conference Schedule

Additional information will be posted there as it becomes available.
The organizers ask those planning to attend to write to woodinbirthdayconference@gmail.com to indicate their intent.

* This meeting is partially supported by the Mid-Atlantic Mathematical Logic Seminar

# Workshop on Mathematical Logic on the Occasion of

Sakaé Fuchino’s 60th Birthday

November 17 – 19, 2014

Kobe University, Kobe, Japan

Sakaé Fuchino will be turning 60 this year, and we will celebrate his birthday with a workshop in his honor. Speakers will be students, collaborators, and colleagues of Sakae, and the talks will reflect his broad research interests in mathematical logic and areas of mathematics with strong connection to logic. While the main focus will be set theory, we also expect talks in other areas of logic like model theory or proof theory, as well as in topology.

The meeting will take place in the week right after the RIMS workshop on Infinitary combinatorics in set theory and its applications (Nov. 10 – Nov. 13, 2014; Research Institute for Mathematical Sciences, Kyoto University, Japan; organizer: Toshimichi Usuba), and we expect that many participants from abroad will stay for both meetings.

### Prospective Participants and Speakers (from outside Kobe U)

 Yoshihiro Abe (Kanagawa U, Yokohama, Japan) David Asperó (U East Anglia, Norwich, UK) Joan Bagaria (U Barcelona, Spain) Tomek Bartoszyński* (NSF, Washington, USA) Aleksander Błaszczyk (U Silesia, Katowice, Poland) Satoko Chitani (Chubu U (emeritus), Kasugai, Japan) Dikran Dikranjan (Ehime U, Japan and U Udine, Italy) Katsuya Eda (Waseda U, Tokyo, Japan) Hiroshi Fujita* (Ehime U, Matsuyama, Japan) Stefan Geschke (U Hamburg, Germany) Masanori Itai* (Tokai U, Tokyo, Japan) Masaru Kada (Osaka Prefecture U, Sakai, Japan) Yo Matsubara* (Nagoya U, Japan) Diego Mejía (KGRC, U Wien, Austria) Tadatoshi Miyamoto (Nanzan U, Nagoya, Japan) Dmitri Shakhmatov (Ehime U, Matsuyama, Japan) Masahiro Shioya (Tsukuba U, Japan) Toshio Suzuki (Tokyo Metropolitan U, Japan) Kazuyuki Tanaka* (Tohoku U, Sendai, Japan) Akito Tsuboi (Tsukuba U, Japan) Boban Veličković (U Paris VII, France) Teruyuki Yorioka (Shizuoka U, Japan) Yasuo Yoshinobu (Nagoya U, Japan)[* = to be confirmed]

### Dates and Venue

The meeting will take place from Nov. 17 (Mon.) till Nov. 19 (Wed.) 2014 in the Faculty of Engineering at Kobe University.

# 60 years of Dow celebrating the mathematics of Alan Dow

December 6–9, 2014

Alan Dow has made deep contributions to set-theoretic topology and has been one of few researchers to pioneer new techniques in set theory which were directly motivated by fundamental topological problems. This conference aims to bring together the different areas of research relating to Professor Dow’s work on compactness, convergence, and their relation to set theory and forcing.

This is a special meeting of the Mid-Atlantic Mathematical Logic Seminar (MAMLS). Support for the meeting is provided by the National Science Foundation.

### Plenary Speakers

• Alexander Arhangelskii, Ohio University
• Todd Eisworth, Ohio University
• Klaas Pieter Hart, Delft University of Technology
• Istvan Juhasz, Alfréd Rényi Institute of Mathematics
• Piotr Koszmider, Polish Academy of Sciences
• Arnold Miller, University of Wisconsin
• Juris Steprans, York University
• Stevo Todorcevic, University of Toronto and University of Paris VII
• Jan van Mill, Vrije Universiteit

Talks will be held in 406 Malott Hall. The 5th floor lounge will be available for coffee breaks. Participants will have lunch on their own.

Time Saturday Sunday Monday Tuesday
9:00 a.m. coffee coffee coffee Koszmider
9:30 a.m. Arhangelskii Juhasz van Mill
10:00 a.m. coffee break
10:30 a.m. Comfort Junilla Bella Vaughan
11:00 a.m. coffee break coffee break coffee break Steprans
11:30 a.m. Miller Eisworth Tkachuk
12:00 p.m. Blass end of
conference
12:30 p.m. lunch break lunch break lunch break
1:00 p.m.
1:30 p.m.
2:00 p.m.
2:30 p.m. Hart Hindman Laflamme
3:00 p.m. Burke Dow
3:30 p.m. Weiss coffee break
4:00 p.m. coffee break Todorcevic coffee/reception
4:30 p.m. Larson Rudin prize
lecture
5:00 p.m. Szeptycki Raghavan

### Dinner Party – December 6

All are invited to a dinner party at Justin Moore’s house at 6:30 p.m. on Saturday, December 6th.

### Organizers

• Michael Hrusak, Universidad Nacional Autónoma de México
• Justin Moore, Cornell University

Additional invited talks will be given as well.  (There will be no contributed talks.)

http://www.math.cornell.edu/~dow

# “Infinity, computability, and metamathematics: Celebrating the 60th birthdays of Peter Koepke and Philip Welch”

In the year 2014, Peter Koepke and Philip Welch are celebrating their 60th birthdays, and we wish to celebrate this festive occasion with a scientific workshop in their honor. Peter has been a professor at the University of Bonn for many years; Philip was a Mercator professor in Bonn during the academic year 2002/03.

## Friday, May 23

 16:30 – 17:00 Coffee 17:00 – 18:00 Joel Hamkins (New York): Colloquium

## Saturday, May 24

 10:00 – 10:50 Joan Bagaria (Barcelona) 10:50 – 11:20 Coffee break 11:20 – 12:10 Moti Gitik (Tel Aviv) 12:10 – 14:30 Lunch break 14:30 – 15:20 Ralf Schindler (Münster) 15:20 – 15:50 Coffee break 15:50 – 16:40 Heike Mildenberger (Freiburg) 16:40 – 17:10 Coffee break 17:10 – 18:00 Arthur Apter (New York)

## Sunday, May 25

 10:10 – 11:00 Jörg Brendle (Kobe) 11:00 – 11:15 Coffee break 11:15 – 12:05 Bernhard Schröder (Duisburg-Essen) 12:05 – 12:10 Coffee break 12:10 – 13:00 Adrian Mathias (Reunion)

## Monday, May 26

 16:30 – 18:00 Vladimir Kanovei (Moscow)