Logo designed by M. Donten-Bury and PP

- is an Algebraic Geometry environment created by Piotr Pragacz (PP)
in 2000 at IM PAN (Institute of Mathematics, Polish Academy of Sciences).
IMPANGA is mainly interested in Complex Algebraic Geometry.

                                                                                                   A goal of IMPANGA is to spread out Algebraic Geometry of good taste among Polish mathematical community.

                                                                                           According to Hartshorne:
"To define algebraic geometry, we could say that it is the study of the solutions of systems
                                                                                            of polynomial equations in an affine or projective n-space. In other words, it is the study of algebraic varieties.

We organize bi-weekly  SEMINAR  IMPANGA, which usually takes place at IM PAN in Warsaw
(the word "seminar" is in Latin or Polish "seminarium", and means in Polish "szkolka roslin", i.e., "a school of plants" in English).

From time to time, we work by research groups.

We also organize workshops and conferences.

    We publish IMPANGA LECTURE NOTES  and other books.

We are working now on:

Conference IMPANGA 20  


Starting from October 2020, the organizing committee of SEMINAR IMPANGA will consist of:
Piotr Achinger, Christophe Eyral, Michał Kapustka and Piotr Pragacz - Honorary Chairman.

Dates of SEMINAR IMPANGA  2020/21:

09.10.      23.10.     06.11.     20.11.     04.12.    18.12.

15.01.      29.01.     19.02.      05.03.    19.03.    

09.04.       23.04.     14.05.      21.05.    11.06.(USA &Brazil online)

The speakers, titles and abstracts of these online Zoom lectures
are given in the page:


For the slides from these lectures, see "Slides" below.

Forthcoming speakers:
May 21: Piotr Pragacz / Claudio Fontanari
June 11: Richard Rimanyi
17:00 / Ariel Molinuevo 18:15       [Warsaw time]


Here you can find the slides of the IMPANGA ZOOM lecture by:

Shinobu Hosono on May 14, 2021
Mirror symmetry of Calabi-Yau manifolds fibered by (1,8)-polarized abelian surfaces

Michael Temkin on May 14, 2021

Logarithmic resolution of singularities

Chiara Camere on April 23, 2021
Projective models of Nikulin orbifolds

Laurent Manivel on April 23, 2021

On the automorphisms of Mukai varieties

Dominik Burek on April 9, 2021
Higher dimensional Calabi-Yau manifolds of Kummer type

Franz-Viktor Kuhlmann on April 9, 2021

Local Uniformization and the Defect

Constantin Shramov on March 19, 2021
Birational automorphisms of Severi-Brauer surfaces

Diletta Martinelli on March 19, 2021

Gale duality, blowups and moduli spaces

Gianluca Piacenza on March 5, 2021
Deformations of rational curves on primitive symplectic varieties and applications

Simone Diverio on March 5, 2021

Pointwise universal Gysin formulae and positivity of some characteristic forms

Ed Segal on February 19, 2021

Discriminants and semi-orthogonal decompositions

Emma Brakkee on February 19, 2021
Moduli spaces of twisted K3 surfaces and cubic fourfolds

Zbigniew Jelonek on January 29, 2021
Whitney theorem for complex polynomial mappings

Vasudevan Srinivas on January 15, 2021
On stratified vector bundles in characteristic p
Evgeny Shinder on January 15, 2021
Factorization centers, Cremona groups and the Grothendieck ring of varieties

Jacinta Torres on December 18, 2020
Minuscule exceptional Schubert varieties

Christophe Eyral on December 18, 2020
On some properties of the Łojasiewicz exponent

Mateusz Michałek on December 4, 2020
Complete quadrics: Schubert calculus for Gaussian models and semidefinite programming

H'el`ene Esnault on November 20, 2020
Special loci of Betti moduli

Sławomir Cynk on November 6, 2020
Hilbert modular double octic Calabi-Yau 3-fold

Ana-Maria Castravet on October 23, 2020
Blown-up toric surfaces with non-polyhedral effective cone

John Christian Ottem on October 23, 2020

Enriques surface fibrations of even index

Bert van Geemen on October 09, 2020
Limits of Hodge classes on decomposable abelian fourfolds

Olivier Debarre on October 09, 2020

Some varieties with PSL(2,F_{11})-actions

Francesco Russo on June 19, 2020

Rationality of cubic fourfolds via Trisecant Flops and via (non-minimal) associated K3 surfaces

Piotr Mormul on June 19, 2020
Special multi-flags at the crossroads of algebraic geometry and differential geometry

Andriy Regeta on June 5, 2020
Automorphism groups of affine spherical varieties

Patrick Popescu-Pampu on May 22, 2020
A tropical and logarithmic study of Milnor fibers

Tadeusz Krasiński on May 8, 2020

The Łojasiewicz exponent of non-degenerate surface singularities


Here you can find information about our SEMINAR IMPANGA in the past (attention: some links expired):

For information about the IMPANGA schools, research groups, sessions and summer seminars,
click here:

IMPANGA schools ...

The two largest events organized by IMPANGA so far were:

IMPANGA Summer School on Algebraic Geometry (2010)
A piano concert for the participants of the School was performed by Pawel Wakarecy in the Kornik castle.
Pawel Wakarecy plays Chopin


Conference on Algebraic Geometry IMPANGA 15 (2015)

The conference hosted 
Session "Pragacz 60"
Fulton's  letter

A piano concert for the participants of the Conference was performed by Maria Wojcik at Dzialynski Palace in Poznan.
Maria Wojcik plays Chopin

There was also a satellite workshop  Projective geometry and syzygies 


The lecture notes from the conference, schools and seminars of IMPANGA form the following Trilogy:




See also a publication about Hoene-Wroński:


English abstracts

Here is an IMPANGA publication dedicated to the memory of Friedrich Hirzebruch:


(J. Buczyński, M. Michałek and E. Postinghel, editors)

Here you can download preliminary versions of the articles in the above volumes:

Lecture notes of IMPANGA 2002-04

Lecture notes of IMPANGA 2005-07

Lecture notes of IMPANGA 2007

Lecture notes of IMPANGA 2010-11

Here you can find four articles, which  discuss what IMPANGA did (2nd article stems from

Wiadom. Matem. 2011 and the 3rd one from NEWSLETTER  IMPAN 2015).

Department of Algebra and Algebraic Geometry of IM PAN in
the last academic year 2019/20 when PP was its head:

Piotr Achinger, Aleksandra Borówka, Jarosław Buczyński, Maciej Dołęga,
Boulous El Hilany, Christophe Eyral, Michał Kapustka, Benoit Guerville-Balle,
Hanieh Keneshlou, Marcin Lara, Michal Marcinkowski, Mateusz
Michałek (on leave), Karol Palka, PP, Filip Rupniewski,  Masha Vlasenko,
Alexander Youcis.


Friedrich Hirzebruch (1927-2012)   was the first foreign speaker at the IMPANGA Seminar and
a good friend to IMPANGA. The attached text appeared in the Proceedings of IMPANGA15


Alexander Grothendieck (1928 - 2014)

Alexander Grothendieck  passed away on November 13 in the hospital of Saint-Girons (French
Department Ariège) not far from Lasserre, the village where he lived from the early 1990's .

Grothendieck was an extremally important inspiration for us in IMPANGA. In 2004, we dedicated to
him a session
at IM PAN :

Hommage a Grothendieck

with participation of many algebraic geometers, topologists and number theorists.
The first volume of the Impanga Lecture Notes "Topics in cohomological studies of algebraic varieties"
(Birkhauser 2005) was dedicated to Grothendieck. You can download the introductory article
"Notes on life
and work of Alexander Grothendieck" (or its Polish version from Wiad. Mat. 40)  from
my web page. An ameliorated English version appeared in
American Mathematical Monthly 13(9) 2006.



Kinosaki in 2014

Since 40 years Japanese algebraic geometers organize symposia at Kinosaki Onsen (2.5 hour by train
from Kyoto).
The first Kinosaki symposia were organized by T. Miyata and M. Nagata, and S. Mori
(very young at that time) was one of the first speakers. In 2014, the symposium took place on 20-24 October
and was organized by K. Oguiso, H. Ohashi and K. Mitsui. Among the speakers were: K. Yoshioka, B. Fu,
 K. Kawatami, M. Wandel, K. Hashimoto, M. Chen, J. Chen,  Ch. Liedtke, Y. Matsumoto, A. Ito, K. Ueda,
A. Bondal and others. The sessions were chaired by: S. Mukai, S. Mori, Y. Kawamata, T. Saito, K. Saito
 and others. The history of Kinosaki symposia was recalled by T. Oda, M. Miyanishi and T.  Shioda. 

After lectures and onsen (Japanese bath), the participants meet in the hall of  the ryokan Tsutaya Inn
(a Japanese-type hotel with tatami) and discuss various matters with sake
until midnight.
Very fruitful discussions indeed...



Alain Lascoux (1944-2013)   was a good friend to IMPANGA. The attached text is a
memorial writing  for Adv. Stud. Pure Math. 71 "Schubert Calculus - Osaka 2012".




In Brasil, in Rio de Janeiro, there is a research institute in maths called IMPA (please note that this name is close to IMPANGA ;-) )
They started around 1952. IMPA has a large building (it contains 3 auditoria , several convenient lecture rooms and many
offices for working mathematicians). This year, in April, May and June, IMPA hosted a trimester on algebraic geometry. Algebraic
geometry is not a leading domain at IMPA (this role is played by dynamical systems with A. Avila - a 2014 Fields medalist) ,
but the direction of IMPA understands a leading role of algebraic geometry in contemporary mathematics. Consult the web page:

Trimester of Algebraic Geometry


E.g.  the lecturers of this first week of June included: O. Debarre, R. Lazarsfeld and B. Totaro.
PP participated there at two conferences in the 2nd half of May: "Higher dimensional algebraic geometry"
and "Rational points", and also at the "Algebra Seminar" directed by Eduardo Esteves, who was the main
organizer of the trimester.

If you will have an occasion to visit IMPA - do it without hesitation (also coffee there is super!). Near IMPA
there is "Jardim Botanico", an ideal place for meditations and work on maths.




Jerzy Browkin (1934-2015)

When I was a student at Warsaw University (1975-76), Jerzy Browkin teached
me the theory of elliptic curves. He also introduced me to Milnor's K-theory.
Jerzy Browkin was often a guest at the IMPANGA seminar, and especially when
we worked on some arithmetic subject. In 2007, he gave a beautiful lecture on
zeros of the Riemann zeta function. This lecture is written and available (see above
in "Lectures notes of IMPANGA 2007"). His mathematical fatherland was
the arithmetic geometry enviroment in Moscow: Shafarevich, Manin, Parshin
"who was able to present in a few sentences a several pages long proof"...
He also evaluated highly Tate, about whom he reported: "there is such
a mathematician who publishes rarely but is often invited with a lecture
to ICM Congresses."



Mariusz Koras (1951 - 2017)

I met Mariusz in 1975 when I was a student at Warsaw University whose
department of mathematics was situated at two floors of the Palace of
Mariusz superwised the exercises to Jerzy Browkin's lectures
on elliptic curves.
In fact, he did all the work, reading with us several
 papers and completing all the details.
I came from Torun and was a
beginner in algebraic geometry, so I liked his style that helped me smoothly
enter the topic. We also knew at that time that Mariusz was a leading
Polish climber, and that he did with Jan Wolf great things on
. Later, Mariusz jointed IMPANGA in 2001-02.
He helped  me greatly with the IMPANGA seminar during
this time, so I was able to go to Paris to work with Alain Lascoux.
Later he coorganized with Karol Palka an IMPANGA school on
affine geometry (Banach Center in Warsaw, June 12-14, 2012).
We hoped so much to have him at IMPANGA for the academic year
2017/18  but unfortunately this is not possible . . .




Here are two quota from ICM 2018, which I find important:

“I am very grateful to CNRS. Langlands program is far from my
first mathematical subject and I would never have been able to devote
myself to it without the great freedom given by CNRS to researchers
to accomplish their work” said Vincent Lafforgue in his acknowledgements.

What Masaki Kashiwara said in his interwiev during
ICM in Rio is worth repeating:
"You have to forget important things to learn new things."



See you at Impanga!