[Abraham Robinson photo] [Alfred Tarski photo]

Istanbul Model Theory Seminar

Begun in October, 2011, the Istanbul Model Theory Seminar usually meets weekly, in the mathematics department of Istanbul Bilgi University or Mimar Sinan Fine Arts University, or elsewhere, as indicated below.

There is a Google Group for this seminar: all interested are encouraged to join this group, for announcements and (rarely) discussion.

The present page has sections for the following semesters:

Possibly of interest


Spring 2014

Who What When where
Piotr Kowalski

on joint work with Serge Randriambololona on Zilber's (more precisely, Peterzil's) conjecture in the valued field context

June 27, 16:00 Galatasaray

Berkovich spaces seminar

Tuesdays, 16:30–18:30, Istanbul Bilgi University (Dolapdere Campus), room 514 (5th floor)

Who What When where
Gönenç Onay // Piotr Kowalski

model-theoretic types and Berkovich points // summary

June 23, 15:00 Mimar Sinan, Fındıklı campus
Thomas Scanlon

intuitions around the main theorem of the paper by Hrushovski–Loeser

May 27, 16:30 IMBM, Boğaziçi
Piotr Kowalski

I will describe the analytic structure on Berkovich affine n-space (with special attention for the n=1 case). Then I will define Berkovich spaces in general and (Berkovich) analytifications of algebraic varieties. Time permitting, I will state the results and conjectures concerning the topological structure of Berkovich spaces including the main theorem of the paper by Hrushovski and Loeser.

May 6, 16:30 Bilgi
David Pierce

Spherical completeness (edited notes [pdf format])

April 29, 16:30 Mimar Sinan
Piotr Kowalski

I will discuss a bit more branching points on Witch's Broom, describe the analytic structure on Berkovich affine line and proceed towards the definition of Berkovich space.

April 22, 16:30 Bilgi
Piotr Kowalski

I will briefly recall the construction of the Berkovich affine line and then focus on visualizing this space for the trivial case and the (non-trivial) non-Archimedean case. I will discuss Berkovich's classification theorem which splits points on the Berkovich affine line into 4 types.

April 15, 16:30 Bilgi
Piotr Kowalski

I will talk about the origins of the notion of Berkovich space. The talk will be based on the introduction to Berkovich's book Spectral theory and analytic geometry over non-Archimedean fields.

April 8, 16:30 Bilgi

Model Theory of Fields

A minicourse by Piotr Kowalski:

I plan to introduce some notions of geometric model theory (Morley rank, stability) in the concrete cases of fields (with a possible extra structure). I would like to emphasize connections between algebraic geometry and model theory, both on a basic level: Ax's theorem and completeness of ACF0, Chevalley's Theorem on Constructible Sets and elimination of quantifiers, existence of the field of definition and elimination of imaginaries; and (time permitting) on a more advanced level: Zilber's trichotomy and diophantine geometry, rationality of Poincare power series and elimination of quantifiers for p-adics.

Who What When where
Piotr Kowalski

Model Theory of Fields: I plan to talk about omega-stable/stable theories and give a rough geography of different theories of fields.

March 13, 10:30 Mimar Sinan
Piotr Kowalski

Model Theory of Fields: definition/examples of Morley rank and quantifier elimination for ACF with some applications

March 6, 10:30 Mimar Sinan
Piotr Kowalski

Model Theory of Fields: basic (affine) algebraic geometry notions, Morley rank, quantifier elimination for ACF and possibly fields of definition/elimination of imaginaries in ACF

February 27, 10:00 Mimar Sinan
Piotr Kowalski

Model Theory of Fields: brief introduction to languages, structures, theories, models; Compactness thm (no proof), Skolem-Lowenheim, model completeness of ACF and Hilbert Nullstellensatz

February 20, 10:00 Mimar Sinan

Fall 2013

Our basic reference this semester is Chatzidakis and Hrushovski, Model theory of difference fields (Trans. Amer. Math. Soc. 351 (1999), no. 8, 2997–3071; review). Ancillary references are:

  1. Alice Medvedev, Minimal Sets in ACFA (PhD thesis: pdf file)
  2. Notes from the workshop The geometry of the Frobenius automorphism (CIRM, 25–29 March 2013)
  3. Zoé Chatzidakis, Model theory of difference fields (lecture notes, Notre Dame, 2000: pdf file)
Who What When where
Burak Kaya Countable Borel equivalence relations and their applications January 15, 15:00 Mimar Sinan
Piotr Kowalski Elimination of Imaginaries in ACFA December 23, 15:30 Mimar Sinan
Serge Randriambololona December 9, 15:30 Mimar Sinan
Ayhan Günaydın December 2, 15:30 Mimar Sinan
David Pierce November 25, 15:30 Mimar Sinan
David Pierce November 18, 15:30 Mimar Sinan
Serge Randriambololona November 11, 15:30 Mimar Sinan
Serge Randriambololona November 4, 15:30 Mimar Sinan
Özlem Beyarslan (Difference algebra) October 28, 16:00 Mimar Sinan
David Pierce (Axiomatization of ACFA) October 7, 16:00 Mimar Sinan

Spring 2013

In the spring of 2013, we meet Thursdays, 16:00–18:00, unless otherwise noted.

Who What When where
Gregory Cherlin Homogeneous ordered graphs (Mimar Sinan general mathematics seminar) May 17, 16:00–17:00 Mimar Sinan
David Pierce Descartes as model theorist May 16 Mimar Sinan
Oleg Belegradek Covering definable open sets by open cells May 9 Mimar Sinan
Gönenç Onay C-minimal modules May 2 Mimar Sinan
Ayşe Berkman Generically sharply transitive actions in the finite Morley rank context April 25 Mimar Sinan
Piotr Kowalski Report on the CIRM workshop, The geometry of the Frobenius automorphism April 18 Mimar Sinan
Alexandre Borovik Finite, locally finite, and pseudofinite groups April 11 Mimar Sinan
Ludomir Newelski Topological dynamics and model theory April 4 (16:00–18:00) Mimar Sinan
April 2 (Tuesday), 15:00–17:00 Galatasaray (P 19)
Piotr Kowalski I will give a preparatory talk before Newelski's lecture. My plan is to recall the following notions: complete types and their Stone topology, Cantor-Bendixson rank, (local) Morley rank, forking in stable theories, stable groups and their generic types. March 21 Mimar Sinan
Cédric Milliet Two remarks on shattering types and an application to groups which are hyperdefinable in a theory without the independence property March 14 Galatasaray (FEF 8)
Piotr Kowalski Chains of theories and group (scheme) actions March 7 Bilgi
David Pierce Chains of theories February 28 Mimar Sinan
Piotr Kowalski Canonical Base Property (Zariski geometries vs jet spaces) February 21 Istanbul Matematiksel Bilimler Merkezi (Boğaziçi Üniversitesi)

Fall 2012

In the fall of 2012, we meet Thursdays, 15:30–17:30. We plan to read:

M. Aschenbrenner, A. Dolich, D. Haskell, D. Macpherson, S. Starchenko,
Vapnik-Chervonenkis density in some theories without the independence property, I
arXiv:1109.5438v1 [math.LO]

Who What When where
Doğan Bilge Rigid moieties of relational homogeneous structures December 27 Mimar Sinan
David Pierce Chains of theories November 29 Mimar Sinan
Ayhan Günaydın (on the paper above) November 8 Mimar Sinan
Adrien Deloro Representations of finite Morley rank November 1 Mimar Sinan
Tuna Altınel A Jordan decomposition for minimal simple groups of finite Morley rank November 1 Mimar Sinan
Sonat Suer (on the paper above) October 18 Mimar Sinan
David Pierce (on Compactness and the paper above) October 11 Mimar Sinan
Ayhan Günaydın (on the paper above) October 4 Mimar Sinan
Oleg Belegradek Homogeneity in relatively free groups October 4 Mimar Sinan
all interested organizational September 27 Mimar Sinan

Spring 2012

In the spring of 2012, we meet Thursdays, 15:00–17:00.

Some of our attention is taken by lectures by Bruno Poizat:

Slides (12 pp.) from Cédric Milliet's talk are also linked to below.

Otherwise our main interest is in:

MR2833482
Hrushovski, Ehud (IL-HEBR-IM)
Stable group theory and approximate subgroups.
J. Amer. Math. Soc. 25 (2012), no. 1, 189–243.
03C45 (11P70)

arXiv:0909.2190v4 [math.LO]

Ancillary material includes:

Who What When where
Piotr Kowalski I will give a proof of Theorem 2.11 from van den Dries' notes (and following these notes) using the Stabilizer Theorem. April 19, 15:20 Bilgi
Jakub Gismatullin (University of Leeds and Uniwersytet Wrocławski) On model-theoretic connected components April 19, 14:10 Bilgi
Piotr Kowalski Stable group theory and approximate subgroups (Keisler measures, S1-ideals and the stabilizer theorem proceeding to a combinatorial application (following Hrushovski´s paper and van den Dries´s notes) April 12 Bilgi
David Pierce Stable group theory and approximate subgroups April 5 Mimar Sinan
David Pierce Stable group theory and approximate subgroups March 29 Bilgi
Bruno Poizat Some dubious properties of groups of finite Morley rank March 22 Mimar Sinan
Cédric Milliet Definable soluble and nilpotent envelopes “around” subgroups in simple theory March 22 Mimar Sinan
Bruno Poizat Some dubious properties of groups of finite Morley rank March 15 Mimar Sinan
Bruno Poizat Some dubious properties of groups of finite Morley rank March 8 Mimar Sinan
Gönenç Onay Stable group theory and approximate subgroups March 1 Bilgi
Gönenç Onay Stable group theory and approximate subgroups February 23 Mimar Sinan
Piotr Kowalski Stable group theory and approximate subgroups February 16 Bilgi

Fall 2011

The main topic of interest in the fall of 2011 is free groups. We read Champetier and Guirardel, Limit groups as limits of free groups: compactifying the set of free groups.

Notes (by David Pierce) based on the seminars.

Who What When where
Ayşe Berkman Limit groups December 30 Bilgi
Ayşe Berkman Limit groups December 23 Mimar Sinan
Özlem Beyarslan Algebraic closure in pseudo-finite fields December 23 Mimar Sinan
David Pierce Limit groups December 16 Bilgi
Özlem Beyarslan Algebraic closure in pseudo-finite fields December 16 Bilgi
David Pierce Limit groups December 9 Mimar Sinan
David Pierce Limit groups December 2 Bilgi
Salih Durhan Hahn fields December 2 Bilgi
David Pierce Limit groups November 18 Mimar Sinan
Oleg Belegradek Coset-minimal groups November 18 Mimar Sinan
Piotr Kowalski Limit groups November 4 Bilgi
Cédric Milliet Definable envelopes around abelian, nilpotent or soluble subgroups in a group with simple theory November 4 Bilgi
Piotr Kowalski Limit groups October 28 Mimar Sinan
Cédric Milliet Definable envelopes around abelian, nilpotent or soluble subgroups in a group with simple theory October 28 Mimar Sinan
Piotr Kowalski Limit groups October 21 Bilgi
Oleg Belegradek Burnside problem October 21 Bilgi
Ali Nesin Free groups; trees October 14 Mimar Sinan
Ali Nesin Free groups October 7 Bilgi

This webpage is maintained by David Pierce.

Last change: Wednesday, 20 August 2014, 14:41:54 EEST