Gdańsk-Kraków-Łódź-Warszawa Seminar in Singularity Theory
dr hab. Ch. Eyral, prof. dr hab. T. Krasiński, dr A. Nowel, dr hab. A. Valette
Academic year 2023 / 2024
Upcoming meeting
24 November 2023
- 10:00 - 10:50 : Ursula Ludwig (Univ. of Münster)
Cheeger-Müller theorem for singular spaces
- 11:00 - 11:50 : M'hammed Oudrane (Univ. of Nice)
Sobolev sheaves on the definable site
Future meetings
1 & 2 December 2023 : on-site mini-workshop at UJ, Kraków
Friday 1st December 2023
14:30 - 15:15 T. Pełka (Warsaw) - Lagrangian tori at radius zero
15:30 - 16:15 A. Weber (Warsaw) - Borel orbit closures of 2-nilpotent matrices
16:15 - 16:45 Coffee break
16:45 - 17:30 J. Banecki (Kraków) - Representation of homotopy classes by regular functions
17:45 - 18:30 T. Krasiński (Łódź) - Topological types in \delta-constant linear deformations of plane curve singularities
Saturday 2nd December 2023
09:00 - 09:45 W. Domitrz (Warsaw) - Singularities of 2-dimensional improper affine spheres
10:00 - 10:45 P. Pokora (Kraków) - Numerical Terao's Conjecture and the freeness of rational curve arrangements
10:45 - 11:15 Coffee break
11:15 - 12:00 Nguyen Xuan Viet Nhan (DaNang) - On the density at infinity of definable maps
12:15 - 13:00 A. Białożyt (Kraków) - tba
8 December 2023
Nicolas Dutertre (Angers) - Grzegorz Oleksik (Poznań)
19 January 2024
Jean-Baptiste Campesato (Angers) - Dmitry Kerner (Be’er Sheva)
Past meetings
13 October 2023
- 10:00 - 10:50 : Jan Stevens (Chalmers Univ. of Technology and Univ. of Gothenburg)
Conjectures on stably Newton degenerate singularities
- 11:00 - 11:50 : Victor Goryunov (Univ. of Liverpool)
Second Arnold-Maslov classes and loops in the spaces of Legendrian and Lagrangian maps of surfaces
Academic year 2022 / 2023
2 June 2023
- 10:00 - 11:00 : Evelia Garcia Barroso (Universidad de la Laguna)
On the Tjurina and Milnor numbers of a foliation
21 April 2023
- 14:30 - 15:30 : Maria Michalska (Universidade Federal do Ceara, Fortaleza)
Classification of Lipschitz normally embedded complex algebraic curves
- 15:45 - 16:45 : Aftab Patel (University of Western Ontario)
Algebraic approximability of analytic germs
24 March 2023
- 10:00 - 11:00 : Enrique Artal Bartolo (Universidad de Zaragoza)
Topology of surface singularities: superisolated, Lê-Yomdin and weighted Lê-Yomdin
- 11:15 - 12:15 : Aleksandra Zakrzewska (Uniwersytet Łódzki)
Extension of the Gusein-Zade theorem on the jumps equal to 1 of the Milnor number in deformations of plane curve singularities
24 February 2023 - special session with Brazil
- 14:00 - 14:45 : Hellen Monção de Carvalho Santana (University of São Paulo)
A study on the local topology of a deformation of a function-germ with a one-dimensional critical set
- 15:00 - 15:45 : Taciana Oliveira Souza (Federal University of Uberlândia)
On the topology of the Milnor fibration
- 16:00 - 16:45 : Eder Leandro Sanchez Quiceno (University of São Paulo)
Links of mixed polynomials with a nice Newton inner non-degenerate boundary
20 January 2023
- 10:00 - 11:00 : Armin Rainer (Universität Wien)
Tame properties of differentiable functions
- 16:00 - 17:00 : Jawad Snoussi (Universidad Nacional Autónoma de México, Cuernavaca)
On tangency in equisingular families of curves and surfaces
12-16 December 2022 (hybrid, online & IMPAN)
Gdańsk-Kraków-Łódź-Warszawa workshop in Singularity Theory - a special session dedicated to the memory of S. Łojasiewicz
18 November 2022
- 8:00 - 8:45 : Dmitry Kerner (Ben Gurion University of the Negev, Be’er Sheva)
Generalizations of Newton non-degeneracy for hypersurface singularities
- 9:00 - 9:45 : Christophe Eyral (IMPAN)
Zeta-function and µ*-Zariski pairs of surfaces
- 10:00 - 10:45 : Goulwen Fichou (Université de Rennes)
Saturation, seminormalization and homeomorphisms of algebraic varieties
Academic year 2021 / 2022
27 May 2022
- 09:00 - 10:00 : Dmitry Kerner (Ben Gurion University of the Negev, Be’er Sheva)
Germs of maps, group actions and large modules inside group orbits
- 10:15 - 11:15 : Helmut Hamm (Universität Münster)
An approach to Zariski-van Kampen theorems
29 April 2022 - special session with Vietnam
- 09:00 - 09:45 : Nguyen Tat Thang (Vietnam Academy of Science and Technology, Hanoi)
Bifurcation set of non-degenerate rational functions
- 10:00 - 10:45 : Nguyen Xuan Viet Nhan (Vietnam Institute for Advanced Study in Mathematics, Hanoi)
Nice cell decomposition and its application to calculating moderately discontinuous homology
- 11:00 - 11:45 : Pho Duc Tai (Hanoi University of Science, Vietnam National University, Hanoi)
Elliptic curves with singularities, from geometry, number theory to post-quantum cryptography
25 March 2022
- 10:00 - 11:00 : Lev Birbrair (Federal University of Ceará, Fortaleza)
Lipschitz geometry of surface germs in R^4: metric knots
- 11:15 - 12:15 : Adam Różycki (Uniwersytet Łódzki)
Effective Bertini theorem and formulas for multiplicity and the local Łojasiewicz exponent
25 Feb. 2022
- 10:00 - 11:00 : Patricio Almirón (Universidad Complutense de Madrid)
The minimal Tjurina number and the 4/3 problem for plane curve singularities
- 11:15 - 12:15 : Maciej Denkowski (Uniwersytet Jagielloński)
Testing Lipschitz non-normally embedded complex spaces
21 Jan. 2022
10:00 - 11:00 : Juan José Nuño-Ballesteros (Univ. València, Spain)
The cone structure theorem
17 Dec. 2021 - special session with Brazil
- 14:15 - 15:00 : Thaís Maria Dalbelo (Univ. Federal de Sao Carlos)
Newton Polyhedra and Whitney Equisingularity for Determinantal Singularities
- 15:15 - 16:00 : José Edson Sampaio (Univ. Federal do Ceara, Fortaleza)
Differential invariance of the multiplicity of real and complex analytic sets
- 16:15 - 17:00 : Otoniel Nogueira da Silva (Univ. Federal de Sao Carlos)
Equisingularity in families of curves and surfaces
26 Nov. 2021
- 10:00 - 11:00 : Jean-Paul Brasselet (I2M CNRS and Aix-Marseille Univ.)
Generic sections of essentially isolated determinantal singularities
- 11:15 - 12:15 : Meral Tosun (Galatasaray Univ., Istanbul)
Lojasiewicz exponent of rational singularities and ideals in their local ring
29 Oct. 2021
- 10:00 - 11:00 : Mark Spivakovsky (CNRS, Univ. Toulouse)
μ-constant families of Newton non-degenerate singularities admit simultaneous embedded desingularization
- 11:15 - 12:15 : Zbigniew Jelonek (IMPAN, Warsaw)
On the Fukui-Kurdyka-Paunescu Conjecture
Academic year 2020 / 2021
28 May 2021 - special session with Japan
- 09:00 - 10:00 : Mutsuo Oka (Tokyo University of Science)
Almost non-degenerate functions and a Zariski pair of links
- 10:15 - 11:15 : Toshizumi Fukui (Saitama University)
Properness of polynomial maps with Newton polyhedrons
30 Apr. 2021
- 10:00 - 11:00 : Wojciech Kucharz (Uniwersytet Jagielloński, Kraków)
Rational approximation of holomorphic maps
- 11:15 - 12:15 : Marcin Bilski (Uniwersytet Jagielloński, Kraków)
Effective approximation of the solutions of algebraic equations
26 Mar. 2021
- 10:00 - 11:00 : Meral Tosun (Galatasaray Üniversitesi, Istanbul)
Simple elliptic singularities and Generalized Slodowy Slices
- 11:15 - 12:15 : Tadeusz Krasiński (Uniwersytet Łódzki)
The Łojasiewicz exponent in non-degenerate deformations of surface singularities
26 Feb. 2021 - special session with Brazil
- 14:00 - 14:45 : Maria Aparecida Soares Ruas (Universidade de Sao Paulo, Sao Carlos)
Mixed Bruce-Roberts number
- 15:00 - 15:45 : Vincent Grandjean (Universidade Federal do Ceara, Fortaleza)
A variation around Malgrange-Rabier condition
- 16:00 - 16:45 : Alexandre Fernandes (Universidade Federal do Ceara, Fortaleza)
Multiplicity of singular points as a bi-Lipschitz invariant
22 Jan. 2021
- 10:00 - 11:00 : Adam Parusiński (Université de Nice)
Equisingular families of surface singularities
- 11:15 - 12:15 : Carles Bivia-Ausina (Universitat Politècnica de València)
Invariants for bi-Lipschitz equivalence of ideals and related topics
11 Dec. 2020
- 10:00 - 11:00 : Wolfgang Ebeling (Leibniz Universität Hannover)
A McKay correspondence for the Poincaré series of some finite subgroups of SL3(C)
- 11:15 - 12:15 : Jean-Philippe Monnier (Université d'Angers)
Some normalizations of real algebraic varieties
27 Nov. 2020
- 11:00 - 12:00 : Beata Gryszka (Uniwersytet Pedagogiczny w Krakowie)
Approximate roots of quasi-ordinary polynomials
- 12:15 - 13:15 : Pedro González Pérez (Unversidad Complutense de Madrid)
The combinatorics of plane curve singularities. How Newton polygons blossom into lotuses
30 Oct. 2020
- 10:00 - 11:00 : David Trotman (Université d'Aix-Marseille)
The smooth Whitney fibering conjecture and density of strongly topologically stable maps
- 11:15 - 12:15 : Grzegorz Oleksik (Uniwersytet Łódzki)
On jumps of the Lê numbers in the family of line singularities