Invitation to the Logic Seminar at the National University of Singapore Date: Wednesday, 14 February 2018, 17:00 hrs Room: S17#0406, Department of Mathematics, NUS Speaker: Wang Wei Title: Combinatorics and Probability in First and Second Order Arithmetic URL: http://www.comp.nus.edu.sg/~fstephan/logicseminar.html Abstract: Recent years see emergence of connections between the reverse mathematics of Ramsey theory and computable measure theory or algorithmic randomness. Here we consider two simple propositions in measure theory which have interesting connections to the reverse mathematics of Ramsey theory. The first is that every set X in Cantor space of positive Lebesgue measure is nonempty. If X is assumed to be effectively closed then this is the wellknown axiom WWKL0. However, if X is allowed to be a little wilder and the proposition is twisted a bit, then it could help in understanding the first order theory of some Ramseyan theorems. The second is that every set X in Cantor space of positive measure has a perfect subset. This proposition is somehow related to a tree version of Ramsey's theorem. But unlike the first one, it is not familiar to people either in algorithmic randomness or reverse mathematics.
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Upcoming conferences
 April 22: Set Theory, Model Theory and Applications (In memory of Mati Rubin), Eilat, April 2226, 2018
 May 16: 2017 North American ASL Meeting, Illinois, March 2023, 2017
 June 25: 11th Young Set Theory Workshop, Lausanne, June 25–29, 2018
 July 16: First Girona inner model theory conference, Girona, July 1627 2018
 July 23: Logic Colloquium 2018, Udine, July 23 – 28, 2018

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 Carnegie Mellon Logic Seminar (RSS)
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 Toronto Set Theory Seminar (RSS)
 UC Irvine Set Theory Seminar (RSS)
 Wrocław University of Technology (RSS)
Talks by speaker
Alan Dow Alekos Kechris Aleksander Cieślak Aleksandra Kwiatkowska Alessandro Vignati Alexei Kolesnikov Andreas Blass Andrés Caicedo Andrés Villaveces Andrew BrookeTaylor Andrew Marks Andrew Toms Andy Zucker Antonio Avilés Anush Tserunyan Ari Brodsky Arthur Apter Asaf Karagila Asger Tornquist Ashutosh Kumar Assaf Hasson Assaf Rinot Barnabas Farkas Benjamin Miller Bill Chen Bill Mitchell Boban Velickovic Boris Zilber Borisa Kuzeljevic Brent Cody Burak Kaya Carlos Di Prisco Carlos MartinezRanero Chris LambieHanson Christian Rosendal Christina Brech Clinton Conley Daisuke Ikegami Dana Bartošová Daniel Rodriguez Daniel Soukup David Aspero David Chodounsky David J. Fernández Bretón David Marker David Milovich David Schrittesser Diana Ojeda Diego Alejandro Mejia Dikran Dikranjan Dilip Raghavan Dima Sinapova Dimitrios Vlitas Dmitri Shakhmatov Egbert Thümmel Erez Shochat Erin Carmody Frank Stephan Franklin Tall Garrett Ervin Gregory Cherlin Grigor Sargsyan Grzegorz Plebanek Gunter Fuchs Heike Mildenberger Hiroshi Sakai Hugh Woodin Ilijas Farah Ioannis Souldatos Isaac Goldbring István Juhász Itay Neeman James Cummings Jan Grebík Jan van Mill Janusz Pawlikowski Jay Williams Jean Larson Jindra Zapletal Jing Zhang Joan Bagaria Joel David Hamkins John Baldwin John Clemens John Krueger John Steel Jonathan Verner Jordi LopezAbad Jörg Brendle Jose Iovino Jouko Väänänen Julien Melleray Juliette Kennedy Juris Steprans Justin Moore K. P. Hart Kaethe Minden Konstantinos Tyros Lajos Soukup Laura Fontanella Liljana Babinkostova Liuzhen Wu Luca Motto Ros Luz María García Ávila Lynn Scow Lyubomyr Zdomskyy Marcin Michalski Marcin Sabok Marion Scheepers Martin Goldstern Martin Zeman Martino Lupini Maryanthe Malliaris Masaru Kada Matteo Viale Matthew D. Foreman Melvin Fitting Menachem Kojman Menachem Magidor Merlin Carl Michael Hrusak Michal Doucha Miguel Angel Mota Miha Habic Mikhail Tkachenko Miodrag Sokic Mirna Džamonja Miyamoto Tadatoshi Monroe Eskew Moti Gitik Nadav Meir Nam Trang Natasha Dobrinen Norman Perlmutter Omer Ben Neria Omer Mermelstein Osvaldo Guzmán González Paul Larson Paul McKenney Peng Yinhe Peter Holy Peter Koellner Peter Koepke Peter Komjath Peter Krautzberger Petr Simon Philip Welch Philipp Lücke Philipp Schlicht Pierre Simon Piotr BorodulinNadzieja Piotr Koszmider Ralf Schindler Randall Holmes Robert Ralowski Robin TuckerDrob Rodrigo R. Dias Roman Kossak Russell Miller Saharon Shelah Sakaé Fuchino Salma Kuhlmann Samuel Coskey Scott Cramer Scott Schneider Sean Cox Sebastien Vasey Sergei Artemov Shehzad Ahmed Simon Thomas Slawomir Solecki Spencer Unger Stefan Geschke Stevo Todorcevic Su Gao Sy David Friedman Szymon Zeberski Taras Banakh Teruyuki Yorioka Thilo Weinert Timothy Trujillo Todd Eisworth Todor Tsankov Tomek Bartoszynski Toshimichi Usuba Trevor Wilson Tristan Bice Uri Abraham Vera Fischer Victor Torres Perez Victoria Gitman Vincenzo Dimonte Wieslaw Kubis Will Boney Wojciech Stadnicki Wolfgang Wohofsky Yair Hayut Yasuo Yoshinobu Yizheng Zhu Yurii KhomskiiCategories
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