Honorary Presidents of the ESTS

The Board of Trustees of the European Set Theory Society decided at its recent meeting in Cambridge that it would be appropriate to honour one or more set theorists with the title of Honorary President of the Society.

The intention was to designate a set theorist or theorists whose work has particularly distinguished the field and contributed to its significant advancement over their career.

The Board unanimously voiced its approval of the suggestion that

András Hajnal (Budapest), Ronald Jensen (Berlin), and Azriel Lévy (Jerusalem)

be approached and asked if they accept this honour. We are delighted to inform the members of the Society that all the three of them have accepted our offer.


Full Professorship (W3) for Mathematical Logic and Foundations of Mathematics, Freiburg

The Faculty of Mathematics and Physics of the University of Freiburg invites applications for a

Full Professorship (W3) for Mathematical Logic and Foundations of Mathematics

(Succession to Prof. Martin Ziegler)

in the Department of Mathematics to be filled by October 2016.

She or he is a person with an established research record in a branch of mathematical logic. Furthermore she or he will be expected to bear an appropriate share of the teaching duties of the Institute of Mathematics as well as of the academic self-administration (government).

Prerequisites for the employment of Professors are a university degree, an outstanding dissertation and an excellent publication record. Substantial achievements and experience in academic research and teaching, at the level of a Habilitation according to the German academic system, are expected. This professorship is also suited as a starting position for highly qualified early career researchers.

The University of Freiburg seeks to increase the number of female scientific faculty members and therefore strongly encourages qualified women to apply for the position. The university is committed to providing a family-friendly workplace.

Applicants with disabilities (Schwerbehinderte) will be given preferential consideration in case of equal qualification.

The following application documents are to be submitted:

In addition, we require the complete application form provided at http://www.zuv.uni-freiburg.de/formulare/bewerbungsbogen_englisch.pdf. Submit this form together with the above-mentioned supporting documents stating the reference number 9409 by 30 October 2015 at the latest either as a pdf-file to dekanat@mathphys.uni-freiburg.de or via mail to the Dean of the Faculty of Mathematics and Physics, University of Freiburg, Eckerstr. 1, 79104 Freiburg, Germany.

For further information, please contact Prof. Dr. Heike Mildenberger under Tel. +49 (0)761 203 5603 or E-Mail heike.mildenberger@math.uni-freiburg.de.

Further information on the appointment procedure can be found in the Code for Practice for professorial appointments, available under


Hausdorff medal 2015

The second Hausdorff medal was awarded by the European Set Theory Society on August 26, 2015, at the fifth European Set Theory Conference, held at the Isaac Newton Institute in Cambridge, to Ronald Jensen (Humboldt University, Berlin) and John Steel (UC Berkeley) for their work K without the measurable.

Statement read by the president of the European Set Theory Society, Istvan Juhasz, at the award ceremony:

Ladies and gentlemen, dear friends and colleagues!

It is my pleasure and privilege, as president of the European Set Theory Society, to announce the winner of the Hausdorff medal. This is awarded by the Board of Trustees of the European Set Theory Society at the biennial European Set Theory Conference for the most influential published work in set theory in the last five years.

Nominations for the Hausdorff medal 2015 were solicited from the members of the Society last fall. Five very worthy nominations were deliberated by the prize committee which consisted of the Board of Trustees augmented with the winner of the previous medal, Hugh Woodin.

After long and serious discussion the unanimous decision was reached that the second Hausdorff medal is awarded to the paper

K without the measurable, The Journal of Symbolic Logic, Volume 78, Issue 3 (2013), 708-734

by Ronald Jensen and John Steel.

Before handing over the medals and the diplomas that go with them to the winners, please allow me to briefly review the winning work.

The construction of core models originates in the seminal work of Dodd and Jensen of just about 40 years ago. Since that time the constructions have been vastly developed and the machinery in its various incarnations is the main tool for showing the necessity of large cardinals for independence proofs. Even more striking is the use of core model methods to prove outright implications of, for example, of determinacy.

Despite all this progress, an absolutely fundamental question remained unresolved. What is the strongest core model which can be constructed just in ZFC? More precisely, suppose there is no inner model with a Woodin cardinal; does then K exist? Jensen and Steel solved this problem in the paper K without the measurable.

The Jensen-Steel construction of K is best possible (having been done just within ZFC) and is therefore a seminal milestone in the entire subject of core models and inner model theory. It marks in some sense the conclusion of a line of investigation which began with Jensen’s Covering Lemma.

It already has many applications, for example as a corollary of their construction, one obtains the equiconsistency of ‘ZFC + There is a saturated ideal on \omega_1’ with ‘ZFC + There is a Woodin cardinal’.

Photo by Hugo Nobrega
John Steel (left), Istvan Juhasz (centre), Ronald Jensen (right), photo by Hugo Nobrega

Upcoming set theory conferences

September 2-September 4 British Logic Colloquium 2015 Cambridge

September 16-September 18 RIMS Set theory workshop 2015: Recent Developments in Axiomatic Set Theory RIMS, Kyoto

September 20-September 21 Hamburg Workshop on Set Theory 2015, Generalized Baire Space Hamburg

September 21-September 23 2015 Symposia on the foundations of mathematics III and the hyperuniverse program Vienna

September 21-September 25 Annual Meeting of the Deutsche Mathematiker-Vereinigung, mini-symposium in Set Theory Hamburg

September 25-September 26 Workshop in Pure and Descriptive Set Theory Torino

October 12-October 16 Set theory and model theory Tehran

October 2 Appalachian Set Theory Workshop: Countable abelian group actions Carnegie Mellon University, Pittsburgh

October 25-October 30, 2015 8th Young Set Theory Workshop

November 2-November 6, 2015 New challenges in iterated forcing Norwich

December 14-December 18 Mathematical, Foundational and Computational Aspects of the Higher Infinite — Final workshop Cambridge

January 6-January 9, 2016 ASL Winter Meeting Seattle

January 30-February 6, 2016 Czech Winter School 2016 Hejnice

Position as Maitre de conférence in mathematical logic, Paris (France), Deadline: 23 Oct 2014

There is going to be an opening for a Maitre de Conférence position (Assistant Professor)
in Mathematical Logic at the University of Paris 7 in 2015. The hiring procedure in France
requires candidates to go through a qualification procedure. This procedure is done
by the CNU (ministry committee). More information can be found on the website of
the section 25 (mathematics) of the CNU


In order to initiate the procedure the candidates should create an account on the website


The deadline for this is October 23 2014. Each candidate will then be assigned two referees
and should then send his/her cv, publications, etc to them. This should be done by
December 19 2014. The qualification will be decided in late January/early February.
The qualification is valid for 4 years. Open positions will be announced in early March 2015.

For more information, please contact Boban Velickovic

ESTS is associate member of the EMS

Dear members,
I am pleased to inform you that our society has been accepted as an associate member of the European Mathematical Society, rubbing shoulders with the likes of the London Mathematical Society and Société Mathématique de France. I suppose that the website http://www.euro-math-soc.eu/member-societies.html will be updated soon. We seem to be the among rare societies which does not correspond to a country, but to a mathematical subject! Best wishes to all, Mirna 
Mirna Dzamonja, President ESTS

Hausdorff Medal

The Hausdorff medal was awarded to Hugh Woodin at the fourth European Set Theory Conference on July 15. 

The Hausdorff medal is awarded by the European Set Theory Society to the most influential published work in set theory in the last five years. This is the first time that the medal is awarded. 

Statement read by the President of the European Set Theory Society, Mirna Dzamonja, at the Award ceremony:

Nominations for the Hausdorff medal 2013 were solicited from the members of the Society in November 2012.

The Board of Trustees deliberated taking into account the goal of the Hausdorff medal of ESTS, which is to award the most influential published work in set theory in the last five years. After considering several very worthy candidates our attention became focused on one particular body of work, consisting of the following papers:

  • Woodin, W. Hugh Suitable extender models I. J. Math. Log. 10 (2010), no. 1-2, pp.101–339.
  • Woodin, W. Hugh Suitable extender models II: beyond \omega-huge. J. Math. Log. 11 (2011), no. 2, pp.115–436.

where the author made a major contribution to the inner model theory of supercompact cardinals and beyond.

This work is innovative, courageous and deep, and no matter what the final solution of this major problem in set theory will look like, it is clear that it will have to depend on the contributions Woodin made in these papers.

Dear collegues, the winner of the first Hausdorff medal of the European Set Theory Society, setting a very high level for the future winners, is Hugh Woodin of the University of Berkeley, California.