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The Colloquium of the Department of Mathematics and Statistics of University of Helsinki


(9-12/2021 chaired by Lauri Oksanen)
17.12.2021Peter Hintz (ETH Zürich)Cancelled (postponed to spring)
24.11.2021Kari Auranen (University of Turku and National Institute for Health and Welfare)

Efficacy and effectiveness of case isolation and quarantine during a growing phase of the COVID-19 epidemic in Finland

26.10.2021Hanne Kekkonen (Delft University of Technology)Statistical guarantees for inverse problems
29.9.2021Julie Rowlett (Chalmers University)The strength of diversity

(1-5/2021 chaired by Sangita Kulathinal)
26.5.2021Mikko J. Sillanpää (University of Oulu)Interaction search in high-dimensional regression models with
applications in genetics
28.4.2021Per Kragh Andersen (University of Copenhagen)Multi-state models for recurrent events
31.3.2021Kaie Kubjas (Aalto University)Geometry of nonnegative rank
24.2.2021Xavier de Luna (Umeå University)Covariate balancing for robust estimation of causal effects of
categorical and continuous treatments
27.1.2021Neil Sheldon (Teaching Statistics Trust, UK)Statistics: what we say and what we mean

(9-12/2020 chaired by Juha Kontinen)
16.12.2020Matti Järvisalo (University of Helsinki)Satisfiability, redundancy, and proofs
25.11.2020Sangita Kulathinal (University of Helsinki)Mathematical challenges in selected statistical problems
28.10.2020Martin Grohe (RWTH Aachen University)Symmetry and Similarity
30.9.2020Dario Gasbarra (University of Helsinki)Algebraic Stein operators for polynomials of Gaussian random variables

(1-5/2020 chaired by Tuomo Kuusi)
27.05.2020Aleksandr Logunov (Princeton University)Nodal sets and Quasiconformal mappings
29.04.2020Weinan E (Princeton University)A Mathematical Perspective of Machine Learning
26.02.2020Anne-Maria Ernvall-Hytönen (University of Helsinki)

On transcendence measures

29.01.2020Mikko Salo (University of Jyväskylä)Inverse problems for partial differential equations

(5-12/2019 chaired by Mats Gyllenberg)
18.12.2019Jarno Vanhatalo (University of Helsinki)Ecological risk assessment in the Arctic Marine areas
27.11.2019Timo Koski (Royal Institute of Technology, Stockholm)On probabilistic sufficient cause models of interaction
30.10.2019Odo Diekmann (Utrecht University)Twin semigroups and delay equations
25.9.2019Åsa Hirvonen (University of Helsinki)Playing games on metric spaces
15.5.2019Bengt Holmström (MIT)The Purpose and Perils of Money Markets – A Contract Theoretic Perspective

(1-4/2019 chaired by Juliette Kennedy)
17.4.2019University Lecturer Ritva Hurri-Syrjänen (University of Helsinki)On Sobolev-type inequalities and beyond
27.3.2019Olli Martio (University of Helsinki)Modulus of a Path Family
27.2.2019Mats Gyllenberg (University of Helsinki)On models of physiologically structured populations and their reduction to ordinary differential equations
30.01.2019Jani Lukkarinen (University of Helsinki)Mathematical puzzles in kinetic theory

(9-12/2018 chaired by Ritva Hurri-Syrjänen)
19.12.2018Associate Professor Jani Virtanen (University of Reading)Toeplitz determinants and their applications in mathematical physics
28.11.2018Professor Agnieszka Kalamajska (University of Warsaw and Polish Academy of Sciences)Strongly nonlinear multiplicative inequalities

Lecturer Tuomas Sahlsten (The University of Manchester)

How to find a criminal from a city of millions?

26.9.2018Senior Lecturer Petteri Harjulehto (University of Turku)Generalized Orlicz spaces and related variational problems

(1-5/2018 chaired by Konstantin Izyurov)
30.05.2018Professor Hugo Duminil-Copin (IHÉS and University of Geneva)Counting self-avoiding walks
25.04.2018Professor Matti Lassas (University of Helsinki)Inverse problems for hyperbolic equations and artificial point sources
28.03.2018University lecturer Hans-Olav Tylli (University of Helsinki)Composition operators on spaces of analytic functions
27.02.2018Professor Tatiana Nagnibeda (University of Geneva)Amenability
31.01.2018Acting Professor Juha Kontinen (University of Helsinki)Logics over finite structures
20.12.2017Professor Stefan Teufel (University of Tübingen)Geometry of periodic quantum systems
29.11.2017Assistant Professor Jarno Vanhatalo (University of Helsinki)Some applications of Gaussian processes in environmental sciences

Professor Charles M. Newman (Courant Institute & New York University)

Riemann Hypothesis and Mathematical Physics
27.9.2017University Lecturer Ilkka Holopainen (University of Helsinki)A local view on minimal surfaces

(1-5/2017 chaired by Pekka Pankka)
31.5.2017Professor Pauliina Ilmonen (Aalto University)On typicality of functional observations
26.4.2017Professor Mario Bonk (UCLA)Uniformization: Past and Present
29.3.2017Professor Nageswari Shanmugalingam (University of Cincinnati)Functions of bounded variation and sets of finite perimeter in metric setting
22.2.2017Professor Mikko Salo (University of Jyväskylä)Diffusion, fractional derivatives and inverse problems
25.1.2017Professor Juan Souto (CNRS / Université de Rennes I)Geometrization of 3-manifolds


Assistant Professor Konstantin Izyurov (University of Helsinki)Conformal invariance in probability and statistical mechanics
30.11.2016Professor Kai Rajala (University of Jyväskylä)Uniformization of non-smooth surfaces
19.10.2016Associate Professor Pekka Pankka (University of Helsinki) From Picard to Rickman: An excursion to quasiregular mappings
28.9.2016Professor Kristian Seip (Norwegian University of Science and Technology)On the growth of the Riemann zeta function
22.6.2016Fields Medalist, Professor Cédric Villani (Institut Henri Poincaré, Paris)Synthetic Ricci curvature -- when Monge, Boltzmann and Riemann get together

(1-5/2016 chaired by Ilkka Holopainen)
25.5.2016Professor David Cruz-Uribe (University of Alabama, Tuscaloosa)The maximal operator, weights and extrapolation on variable Lebesgue spaces
27.4.2016Professor Xiao Zhong (University of Jyväskylä)On the Euler-Lagrange equation of a functional by Pólya and Szegö
30.3.2016Professor (emer.) Pertti Mattila (University of Helsinki)In search of analytic and harmonic functions
24.2.2016Research Professor Ilkka Norros (VTT Technical Research Centre of Finland Ltd)Mathematics of peer-to-peer networking


Professor Pekka Koskela (University of Jyväskylä)Planar Sobolev extension domains

(9-12/2015 chaired by Jari Taskinen)
16.12.2015Professor Jeremy Tyson (University of Illinois)Bi-Lipschitz embeddings and differentiation
25.11.2015Professor Jesper Lützen (University of Copenhagen)Laurent Schwartz' Danish Connection
28.10.2015Professor Nathanael Berestycki (University of Cambridge)Recent developments in Liouville quantum gravity
30.09.2015Professor Kaisa Nyberg (Aalto University)Improving Accuracy of Statistical Cryptanalysis

(1-5/2015 chaired by Matti Lassas)
27.05.2015Professor Juha Oikkonen (Univ. of Helsinki)What is there in improving university level math courses?
29.04.2015Professor Jouko Mickelsson (University of Helsinki)K Theory and Physics
25.03.2015Professor Spyridon Alexakis (University of Toronto)The impossibility of periodic motion in general relativity
25.02.2015Professor Kalle Kytölä (Aalto University)Conformally invariant scaling limits
28.01.2015Professor Samuli Siltanen (University of Helsinki)Inverse Problems in Human Speech

(10-12/2014 chaired by Mats Gyllenberg)
17.12.2014Timo Koski (KTH, Stockholm)Arthur Cayley, Independent Causation and Rothman's Pie
26.11.2014Odo Diekmann (Utrecht University)Delay Equations
29.10.2014Boban VelickovicForcing axioms and their use in mathematics
01.10.2014Johan Stén (VTT)Anders Johan Lexell - a Finnish comet of the Enlightenment
28.05.2014Professor Heikki Haario (Lappeenranta University of Technology)Talk on uncertainty quantification of weather and climate models
23.04.2014University lecturer Juliette Kennedy (University of Helsinki)Turing, Gödel, Formalism Freeness and Inner Models of Set Theory
26.03.2014Assistant Professor Camilla Hollanti (Aalto University)Algebraic Number Theory meets Wireless Communications
26.02.2014Professor Erik Aurell (KTH, Stockholm)Inference for large-scale Potts models using pseudolikelihood
29.01.2014Assistant Professor Teemu Roos (University of Helsinki)Complexity in Statistical Inference

(9-12/2013 chaired by Tuomas Hytönen)
18.12.2013Stefanie Petermichl (Universite Paul Sabatier, Toulouse)Hankel operators and their generalisations in Real Analysis
27.11.2013Juha Alho (University of Helsinki)How long can we live? Statistical perspectives on longevity
30.10.2013Valtteri Niemi (University of Turku)Classes of garbling schemes
25.09.2013Tuomo Kuusi (Aalto University)Potential estimates and nonlinear partial differential equations
20.02.2013Per Christian Hansen (Technical University of Denmark)Image deblurring with Krylov subspace methods
30.01.2013Andres Villaveces (National University of Colombia)Model theory, becoming more geometric?
28.11.2012Jean-Pierre Eckmann (University of Geneva)Atoms, Nuclei and 3D triangulations
31.10.2012Professor Kaisa Matomäki (Turku University)Additive problems involving primes
26.09.2012Professor Alexander Engström (Aalto University)Polytopes from subgraph statistics

(1-5/2012 chaired by Jouko Mickelsson)
23.05.2012Professor Peter Jones (Yale University)Product Formulas for Measures and Applications to Analysis and Geometry
25.04.2012Professor Jukka CoranderHow has our understanding about bacterial evolution evolved during the genomic era?
28.03.2012Associate professor Tuomas HytönenHow much, or little, is necessary for (harmonic) analysis?
29.02.2012Doctor Esko Keski-VakkuriD-branes and dualities
25.01.2012Professor Matti LassasCloaking, Invisibility, and Inverse Problems
14.12.2011University Lecturer Jari TaskinenWheeltappers, compact sets and sobolev embeddings
30.11.2011Professor Mika Seppälä (University of Helsinki and Florida State University)Algebraic Curves, Riemann Surfaces, and their Jacobians
26.10.2011Professor Gunther Uhlmann (University of Washington, Seattle)Inverse geometry
28.09.2011Professor Tom Körner (Cambridge University)Why is Analysis 101 so hard?
25.05.2011Professor Gaven J. Martin (Massey University, New Zealand)Quasiregular Mappings, Curvature & Dynamics
27.04.2011Professor Pentti SaikkonenParameter Estimation in Nonlinear Autoregressive Models with Generalized Autoregressive Conditional Heteroskedasticity
30.03.2011Professor Kari AstalaHolomorphic motions
23.02.2011Professor Jouko VäänänenLogic and set theory
26.01.2011Professor Peter Lindqvist
(Norwegian University of Science and Technology, Trondheim)
The Infinity-Laplace Equation
15.12.2010Professor Kari Vilonen (Northwestern University)The microlocal codimension three conjecture
24.11.2010Professor Antti KupiainenRenormalization - from Magic to Mathematics
27.10.2010Professor Michael Lacey (Georgia Institute of Technology)Pointwise Convergence of Fourier Series: Past, Present and Future
29.09.2010Professor Jukka CoranderHave I Seen You Before? Principles of predictive classification revisited
15.09.2010Professor Menachem Magidor (Hebrew University, Jerusalem)Some reflections on the Continuum Hypothesis

(1-4/2010 chaired by Kari Astala)
28.04.2010Professor Eero SaksmanOn random geometry
31.03.2010Professor Jean Bricmont (Université catholique de Louvain)From the microscopic to the macroscopic world
24.02.2010Professor Karen Smith (University of Michigan + University of Jyväskylä)Thresholds of Singularities
27.01.2010Professor Juha Kinnunen (Helsinki University of Technology - Aalto University)On a theorem of Beckenbach and Rado for subharmonic functions

(9-12/2009 chaired by Eero Saksman)
09.12.2009University lecturer Tapani HyttinenFinding fields
25.11.2009Professor Maarit JärvenpääHow to turn a needle?
28.10.2009Professor Jani OnninenDeformations of finite (total) conformal energy and the nitsche conjecture
30.09.2009Professor Matti JutilaThe role of Hardy's function in the theory of Riemann's zeta function

(1-6/2009 chaired by Lassi Päivärinta)
03.06.2009Professor Mats GyllenbergPopulation dynamics, delay equations and semigroups
29.04.2009Professor Jouko MickelssonThe Good, the Bad and the Ugly: the operator residue, the trace and the fredholm index
25.03.2009Professor Yuval Peres (Microsoft research and University of Washington)Visual mathematics - the case of fair allocations
25.02.2009Professor Samuli SiltanenInversion methods for three-dimensional medical x-ray imaging
28.01.2009Professor Elja ArjasRandomness, probability and learning: some simple illustrations and ideas
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