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YSTW2015: Saharon Shelah is telling a joke..:

https://www.youtube.com/watch?v=xw64U2xjtw8&t=1782

Daniel T. Soukup – New aspects of ladder system uniformization II

Talk held by Daniel Soukup (KGRC) at the KGRC seminar on 2018-12-13. Abstract: We continue the previous lecture and present proofs for some of the new results. We show that $\diamondsuit$ implies that for any Aronszajn-tree $T$, there is a ladder system with a 2-colouring with no $T$-uniformization. However, if $\diamondsuit^[...]

https://settheory.mathtalks.org/daniel-t-soukup-new-aspects-of-ladder-system-uniformization-ii/

Asaf Karagila: On countable unions of countable sets

BIU seminar in Set Theory December 17, 2018 Speaker: Asaf Karagila (UEA) Title: On countable unions of countable sets Abstract. How big can countable unions of countable sets be? Assuming the axiom of choice, countable. Not assuming the axiom of choice, it is not hard to arrange situation where there are many incomparable cardinals which…[...]

https://settheory.mathtalks.org/asaf-karagila-on-countable-unions-of-countable-sets/

Ilijas Farah: On the model theory of C*-algebras

HUJI Logic Seminar 12/December/18, 11 am, in Ross 63. Speaker: Ilijas Farah Title: On the model theory of C*-algebras Abstract. Ultrapowers and reduced products play a central role in the Elliott classification program for separable (nuclear, etc.) C*-algebras. Although an ultrapower of a separable C*-algebra A is quite different from the reduced product $\e[...]

https://settheory.mathtalks.org/ilijas-farah-on-the-model-theory-of-c-algebras/

Clovis Hamel: Stability and Definability in Continuous Logics, Cp-theory and the Tsirelson space.

Place: Fields Institute Library Date: Decembver 7, 2018 (13:30-15:00) Speaker: Clovis Hamel Title: Stability and Definability in Continuous Logics, Cp-theory and the Tsirelson space. Abstract: An old question in Functional Analysis inquired whether there is a Ba[...]

https://settheory.mathtalks.org/clovis-hamel-stability-and-definability-in-continuous-logics-cp-theory-and-the-tsirelson-space/

Stevo Todorcevic – Ramsey degrees of topological spaces

Talk held by Stevo Todorcevic (University of Toronto, Canada) at the KGRC seminar on 2018-12-04. Abstract: This will be an overview of structural Ramsey theory when the objects are topological spaces. Open problems and directions for further research in this area will also be examined.[...]

https://settheory.mathtalks.org/stevo-todorcevic-ramsey-degrees-of-topological-spaces/

James Cummings: Regular cardinals and compactness

Mathematical logic seminar - Dec 4 2018 Time: 3:30pm - 4:30 pm Room: Wean Hall 8220 Speaker: James Cummings Department of Mathematical Sciences CMU Title: Regular cardinals and compactness Abstract: This talk is a sequel of sorts to last week's talk on singular compactness, but is completely independent of it. I will [...]

https://settheory.mathtalks.org/james-cummings-regular-cardinals-and-compactness/

Miloš Kurilić: Vaught’s Conjecture for Monomorphic Theories

Place: Fields Institute (Room 210) Date: November 30, 2018 (1:00-2:00) Speaker: Miloš Kurilić Title: Vaught's Conjecture for Monomorphic Theories Abstract: A complete first order theory of a relational signature is called monomorphic iff all its models are monomorphic (i.e.\ have all the $n$-element substructures isomorphic, for e[...]

https://settheory.mathtalks.org/milos-kurilic-vaughts-conjecture-for-monomorphic-theories/

Jordi Lopez-Abad: Approximate Ramsey property of normed spaces

Place: Fields Institute (Room 210) Date: November 30, 2018 (2:00-3:00) Speaker: Jordi Lopez-Abad Title: Approximate Ramsey property of normed spaces Abstract: We will present and discuss the known examples approximate Ramsey properties of normed spaces. In some cases, this can be seen as a multidimensional Borsuk-Ulam Theorem, [...]

https://settheory.mathtalks.org/jordi-lopez-abad-approximate-ramsey-property-of-normed-spaces/

David Chodounsky: Generic ultrafilters

Place: Fields Institute (Room 210) Date: November 30, 2018 (12:00-1:00) Speaker: David Chodounsky Title: Generic ultrafilters Abstract: S. Todorcevic proved that given the presence of large cardinals, selective ultrafilters are precisely ultrafilters P(omega)/FIN-generic over L(R). We generalize this result. We provide a characterization of P(omega)/I-generic ultrafilters ove[...]

https://settheory.mathtalks.org/david-chodounsky-generic-ultrafilters/

Daniel Soukup – New aspects of ladder system uniformization

Talk held by Daniel Soukup (KGRC) at the KGRC seminar on 2018-11-29. Abstract: Given a tree $T$ of height $\omega_1$, we say that a ladder system colouring $(f_\alpha)_{\alpha\in \lim\omega_1}$ has a $T$-uniformization if there is a function $\varphi$ defined on a subtree $S$ of $T$ so that for any $s\in S_\alpha$ of limit height and a[...]

https://settheory.mathtalks.org/daniel-soukup-new-aspects-of-ladder-system-uniformization/

Saharon Shelah: The spectrum of the existence of a universal model

HUJI Logic Seminar 21 November 2018 Speaker: Saharon Shelah Title: The spectrum of the existence of a universal model Abstract. The existence of a universal model (of a theory T in a cardinal lambda) is a natural question in model theory and set theory. We shall deal with new sufficient conditions for non-existence.[...]

https://settheory.mathtalks.org/saharon-shelah-the-spectrum-of-the-existence-of-a-universal-model/

7th European Set Theory Conference, Vienna, July 1-5, 2019

The 7th European Set Theory Conference (6ESTC) of the European Set Theory Society will take place in Vienna, July 1 – 5, 2019. The list of invited speakers include: Jörg Brendle (Kobe University), Mirna Džamonja (University of East Anglia), Moti Gitik (Tel Aviv University), Alexander Kechris (Caltech), Piotr Koszmider (Polish of Academy of Sciences), Maryanthe…[...]

https://settheory.mathtalks.org/7estc/

12th Young Set Theory Workshop, Vienna, June 24 – 28, 2019

This year’s Young Set Theory Workshop will take place in Vienna, Austria, June 24 - 28, 2019. The program consists of 6 tutorials, four one hour lectures by each speaker. The speakers are: Jörg Brendle (Kobe University), Justin Moore (Cornell University), Alexander Kechris (Caltech), Slawomir Solecki (Cornell University), Matteo Viale (University of Torino), Hugh Woodin…[...]

https://settheory.mathtalks.org/yst2019/

Raphaël Carroy – A dichotomy for topological embeddability between continuous functions

Talk held by Raphaël Carroy (KGRC) at the KGRC seminar on 2018-11-22. Abstract We say a function $f$ embeds (topologically) in a function $g$ when there are two topological embeddings $\sigma$ and $\tau$ satisfying $\tau \circ f = g \circ \sigma$. I will prove the following dicho[...]

https://settheory.mathtalks.org/raphael-carroy-a-dichotomy-for-topological-embeddability-between-continuous-functions/

Yair Hayut: Chang’s conjecture

HUJI Set Theory Seminar November 21, 2018 Speaker: Yair Hayut Abstract. I will review some consistency results related to Chang's Conjecture (CC). First I will discuss some classical results of deriving instances of CC from huge cardinals and the new results for getting instances of CC from supercompact cardinals, and present some open problems. Then,…[...]

https://settheory.mathtalks.org/yair-hayut-changs-conjecture/

Russell G. Miller – Hilbert’s Tenth Problem for Subrings of the Rational Numbers

Talk held by Russell Miller (Queens College, City University of New York (CUNY), USA) at the KGRC seminar on 2018-11-15. Abstract: When considering subrings of the field $\mathbb{Q}$ of rational numbers, one can view Hilbert’s Tenth Problem as an operator, mapping each set $W$ of prime nu[...]

https://settheory.mathtalks.org/russell-g-miller-hilberts-tenth-problem-for-subrings-of-the-rational-numbers/

Noé de Rancourt: Gowers spaces: unifying standard and strategical Ramsey theory

Place: Fields Institute (Room 210) Date: November 16 , 2018 (13:30-15:00) Speaker: Noé de Rancourt Title: Gowers spaces: unifying standard and strategical Ramsey theory Abstract: Strategical Ramsey theory was developed in the nineties by Gowers in the setting of Banach spaces; in this setting whe[...]

https://settheory.mathtalks.org/noe-de-rancourt-gowers-spaces-unifying-standard-and-strategical-ramsey-theory/

Shimon Garti: Cardinal invariants for singular cardinals

HUJI Set Theory Seminar November 14, 2018 Speaker: Shimon Garti Abstract. We shall try to prove the consistency of d_lambda > r_lambda (and even d_lambda > u_lambda) for a singular cardinal lambda. This is a joint work with Saharon.[...]

https://settheory.mathtalks.org/shimon-garti-cardinal-invariants-for-singular-cardinals/

Jialiang He: Selection covering properties and Cohen reals

BIU seminar in Set Theory November 12, 2018 Speaker: Jialiang He (BIU) Title: Selection covering properties and Cohen reals Abstract: We will introduce four selection covering properties (Menger, Hurewicz, Rothberger and Gamma property) and consider preserving results on these properties under Cohen forcing.[...]

https://settheory.mathtalks.org/jialiang-he-selection-covering-properties-and-cohen-reals/

call for nominations for the Hausdorff medal 2019

The European Set Theory Society would like to announce a call for nominations for the Hausdorff Medal 2019. This prize rewards the most influential work (i.e. paper) in set theory published between 01.01.2014 and 31.12.2018. The first prize was awarded to Hugh Woodin in 2013 and the second one to Ronald Jensen and John Steel in…[...]

https://settheory.mathtalks.org/call-for-nominations-for-the-hausdorff-medal-2019/

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Joined Apr 2018