David Asperó &#8211; Special $\aleph_2$-Aronszajn trees and GCH
Talk held by David Asperó (University of East Anglia, Norwich, UK) at the KGRC seminar on 2018-10-22. Abstract: In joint work with Mohammad Golshani, and assuming the existence of a weakly compact cardinal, we build a forcing extension in which GCH holds and every $\aleph_2$-Aronszajn tree is special. This answers a well-kn[...]
settheory.mathtalks.org/david-

Reflections on Set Theoretic Reflection, Sant Bernat, November 16-19, 2018
Reflections on Set Theoretic Reflection  16-19 November 2018 Sant Bernat, Montseny, Catalonia   Set Theory Conference Organised in partnership with the Clay Mathematics Institute Keynote Speakers Peter Koellner (Harvard) Paul Larson (Miami) Menachem Magidor (Jerusalem) Jouko Väänänen (Helsinki [...]
settheory.mathtalks.org/bagari

Monroe Eskew &#8211; Rigid ideals
Talk held by Monroe Eskew (KGRC) at the KGRC seminar on 2018-10-18. Abstract: Using ideas from Foreman-Magidor-Shelah, one can force from a Wooden cardinal to show it is consistent that the nonstationary ideal on $\omega_1$ is saturated while the quotient boolean algebra is rigid. The key is to apply Martin's Axiom to the almost-disjoint coding forcing to&hellip;[...]
settheory.mathtalks.org/monroe

Winter School, Hejnice, Jan 26–Feb 2, 2019
The Winter School in Abstract Analysis, section Set Theory &amp; Topology will take place between January 26th and February 2nd 2019 in Hejnice, Czech Republic. Tutorial speakers for the Winter School 2018 are: James Cummings Miroslav Hušek Wiesław Kubiś Jordi Lopez-Abad The registration is now open. The confe[...]
settheory.mathtalks.org/winter

David Chodounský &#8211; Silver forcing and P-points
Research seminar, Kurt Gödel Research Center - Thursday, October 11th Abstract: I will give a full proof of a joint result with O. Guzman regarding a technique for destroying P-ultrafilters with Silver forcing. Time permitting, I will present several applications.[...]
settheory.mathtalks.org/david-

Gerhard Jäger &#8211; From fixed points in weak set theories to some open problems
Research seminar, Kurt Gödel Research Center -  October 9th Abstract: Least fixed points of monotone operators are well-studied objects in many areas of mathematical logic. Typically, they are characterized as the intersection of all sets closed under the respective operator or as the result of i[...]
settheory.mathtalks.org/gerhar

Logic Colloquium 2019
European Summer Meeting of the Association for Symbolic Logic, Logic Colloquium '19 will take place during August 11th–16th in Prague, Czech Republic. Program Committee Lev Beklemishev (Moscow, chair), Andrew Arana (Paris), Agata Ciabattoni (Vienna), Russell Miller (New York), Martin Otto (Darmstadt), Pavel Pudlák (Prague), Stevo Todorčević (Toronto), Alex Wilkie (Manchester) Organizing Committee David Ch[...]
settheory.mathtalks.org/logic-

David Fernández-Bretón &#8211; Finiteness classes arising from Ramsey-theoretic statements in set theory without choice
Talk held by David Fernández-Bretón (KGRC) at the KGRC seminar on 2018-10-04. Abstract: In the absence of the Axiom of Choice, there may be infinite sets for which certain Ramsey-theoretic statemen[...]
settheory.mathtalks.org/david-
-Bretón

50 Years of Set Theory in Toronto, Fields institute, May 13-17, 2019
PRELIMINARY ANNOUNCEMENT &nbsp;   50 Years of Set Theory in Toronto, May 13-17, 2019 This conference will celebrate  the 50th anniversary of the Toronto Set Theory Seminar. Its purpose is to introduce and/or survey contemporary work in the areas currently investigated by Seminar members. The conference will  take plac[...]
settheory.mathtalks.org/50-yea

Asaf Karagila: Models of Bristol
Tuesday, October 2, 2018, 15.00 Howard House 4th Floor Seminar Room Speaker: Asaf Karagila (University of East Anglia) Title: Models of Bristol Abstract: The Bristol model lies in between L and a Cohen extension given by a single real. It is an unusual model of set theory without the axiom of choice in that it&hellip; ...
settheory.mathtalks.org/asaf-k

Logic Seminar 19/09/2018 17:00 hrs at NUS
Invitation to the Logic Seminar at the National University of Singapore Date: Wednesday, 19 September 2018, 17:00 hrs Room: S17#04-05, Department of Mathematics, NUS Speaker: Ashutosh Kumar Title: Saturated null and meager ideal URL: comp.nus.edu.sg/~fstephan/logi Abstract: We will sketch some ideas behind the proof of the following: The null and the me ...
settheory.mathtalks.org/logic-

Wednesday seminar
Dear all, The seminar meets on Wednesday September 19th at 11:00 in the Institute of Mathematics CAS, Zitna 25, seminar room, 3rd floor, front building. Program: Michał Korch -- The class of perfectly null sets and its transitive version (joint work with Tomasz Weiss) The ideals of universally null sets (UN, sets which are null&hellip; ...
settheory.mathtalks.org/wednes

Damjan Kalajdzievski: Bounding, splitting, almost disjointness and covering of the meager ideal
Place: Fields Institute (Room 210) Date: , 2018 (13:30-15:00) Speaker: Damjan Kalajdzievski Title: Bounding, splitting, almost disjointness and covering of the meager ideal Abstract:This talk is on joint work with Osvaldo Guzman. This talk will go over forcing $\omega_1= ... settheory.mathtalks.org/damjan no seminar this week, Jing Zhang next week on rainbow ramsey ... settheory.mathtalks.org/no-sem Logic Seminar 12 Sept 2018 17:00 hrs at NUS Invitation to the Logic Seminar at the National University of Singapore Date: Wednesday, 12 September 2018, 17:00 hrs Room: S17#04-05, Department of Mathematics, NUS Speaker: Borisa Kuzeljevic Title: P-ideal dichotomy and some versions of the Souslin's Hypothesis URL: comp.nus.edu.sg/~fstephan/logi P-ideal dichotomy is a combinatorial set theoretic ... settheory.mathtalks.org/logic- Set Theory Today - conference livestream We are happy to announce that the talks at the Set Theory Today conference (10-14 September 2018) will be recorded and live streamed on the conference website sites.google.com/view/set-theo. The schedule is also accessible on our website. Please feel free to follow and comment! ... settheory.mathtalks.org/set-th Osvaldo Guzman: On restricted MADness Place: Fields Institute (Library) Date: September 7, 2018 (13:30-15:00) Speaker: Osvaldo Guzman Title: On Restricted MADness Abstract: Let$\mathcal{I}$be an ideal on$\omega.$We define \textsf{cov}$^{\ast}\left( \mathcal{I}\right) $as the least size of a family$\mathcal{B\subseteq I}$such that for every infinite$X\in\mathcal{I}$there is$B\in\mathcal{B}$for which$B\cap X\$ ...
settheory.mathtalks.org/osvald

CMU math logic seminar, Tue 4 Sep at 3:30, Bernshteyn on "From finite
...
settheory.mathtalks.org/cmu-ma

Special session on Large cardinals and combinatorial set theory, Ann Arbor, October 20-21, 2018
Paul Larson and Andrés E Caicedo are co-organizing a special session at the Fall Central Sectional Meeting 2018 in Ann Arbor, on Large cardinals and combinatorial set theory. The session will take place Saturday October 20 and Sunday October 21. Special Session on Large ...
settheory.mathtalks.org/specia

Generalised Baire Spaces, Amsterdam, August 22-24, 2018
KNAW Academy Colloquium Generalised Baire Spaces Amsterdam, The Netherlands Master Class: 22 August 2018 / Colloquium: 23–24 August 2018 Organisers. Lorenzo Galeotti, Benedikt Löwe, Philipp Lücke. Descriptive set theory and set theory of the reals traditional deal with well-known and well-studied topological spaces such as the real numbers, Cantor ...
settheory.mathtalks.org/genera

## A Mastodon instance for academics

Scholar Social is meant for: researchers, grad students, librarians, archivists, undergrads, academically inclined high schoolers, educators of all levels, journal editors, research assistants, professors, administrators—anyone involved in academia who is willing to engage with others respectfully.

We strive to be a safe space for queer people and other minorities, recognizing that there can only be academic freedom where the existence and validity of interlocutors' identities is taken as axiomatic.

"A Mastodon profile you can be proud to put on the last slide of a presentation at a conference"

## "Official" monthly journal club!

(Participation is, of course, optional)

Scholar Social features a monthly "official" journal club, in which we try to read and comment on a paper of interest.

Any user of Scholar Social can suggest an article by sending the DOI by direct message to @socrates@scholar.social and one will be chosen by random lottery on the last day of the month. We ask that you only submit articles that are from *outside* your own field of study to try to ensure that the papers we read are accessible and interesting to non-experts.