## Visiting address

Ullevål StadionSognsveien 77B

0855 OSLO

Norway

Norwegian version of this page
# Guest lectures and seminars

## Upcoming

## Previous

Time and place:
Sep. 4, 2018 2:15 PM - 3:15 PM,
Niels Henrik Abels hus, 8th floor

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Paolo Vidoni (Department of Economics and Statistics, University of Udine) will give a talk on September 4th at 14:15 in the Seminar Room 819, Niels Henrik Abels hus, 8th floor.

Time:
Sep. 10, 2018

Paul Arne Østvær will speak at the conference Motives and their applications, at the Euler International Mathematical Institute in St. Petersburg.

Time:
Sep. 13, 2018 -
Sep. 14, 2018

Paul Arne Østvær will give a talk in the parallel session at the National Mathematicians meeting in Bergen held on September 13--14, 2018.

Geoff Nicholls (Department of Statistics, University of Oxford) and Idris Eckley (Mathematics and Statistics, Lancaster University) will both give a talk on September 17th, at 13:45 and 14:45, respectively, in the Seminar Room 819, Niels Henrik Abels hus, 8th floor.

Time:
Nov. 15, 2018

Paul Arne Østvær will speak at the conference New trends in K-theory and homotopy theory at Institut Henri Poincaré in November.

Time and place:
Aug. 9, 2018 11:15 AM - 12:00 PM,
NHA 919

Christophe Henry

Post doc at Observatoire de la Cote d'Azur, Laboratoire Lagrange

Time:
Aug. 6, 2018 2:45 PM - 3:30 PM

Ivan Panin will speak at the International Congress of Mathematicians in Rio de Janeiro.

Time:
July 23, 2018 10:15 AM -
July 27, 2018 12:00 PM

Charanya Ravi will speak at K-Theory Workshop, a satellite event of the ICM 2018.

Time:
July 10, 2018

Paul Arne Østvær will give a talk on A^{1}-contractible varieties at the London Mathematical Society and Clay Mathematics Institute Research School on Homotopy Theory and Arithmetic Geometry: Motivic and Diophantine Aspects, Imperial College, 9-13 July 2018.

Time:
July 4, 2018 2:30 PM - 3:30 PM

Paul Arne Østvær will give a lecture at the University of Oxford on A^{1}-contractible varieties.

Time and place:
June 27, 2018 11:15 AM - 12:00 PM,
Seminar room 1020, Niels Henrik Abel's house

Time and place:
June 7, 2018 1:15 PM - 2:00 PM,
Seminar room "Hurricane"

Time and place:
June 6, 2018 9:15 AM - 4:30 PM,
Hotel Bristol

A seminar in the honour of Erik Bølviken at his 70’th birthday.

Time:
June 1, 2018 -
July 31, 2018

Paul Arne Østvær will hold a lecture series as a Nelder visiting fellow at the Imperial College London during June and July of 2018.

Time:
May 31, 2018 9:30 AM - 10:20 AM

Sabrina Pauli will speak at the conference Algebraic Geometry - Mariusz Koras in memoriam at the Institute of Mathematics, Polish Academy of Sciences on "A1-contractibility of Koras-Russell like varieties."

Time and place:
May 30, 2018 11:35 AM - 12:20 PM,
Seminar room "End of the Line"

Time and place:
May 30, 2018 11:00 AM - 11:30 AM,
Gates of Eden, Ullevål stadion (Sognsveien 77 B, 2nd floor)

Kostiantyn Ralchenko (Taras Shevchenko National University of Kyiv) gives a lecture with the title: Maximum likelihood estimation for drift parameter of Gaussian process.

Time and place:
May 30, 2018 10:30 AM - 11:00 AM,
Gates of Eden, Ullevål stadion (Sognsveien 77 B, 2nd floor)

Yuliia Mishura (Taras Shevchenko National University of Kyiv) gives a lecture with the title: Fractional Cox-Ingersoll-Ross process and its applications to financial markets.

Time and place:
May 29, 2018 10:00 AM -
May 30, 2018 1:00 PM,
Georg Sverdrups hus Auditorium 2 (BL271511)

On the 29th and 30th of May, a topology meeting will convene at the University of Oslo to discuss a broad range of topics in topology, including topological Hochschild homology, motivic homotopy theory, symplectic geometry, and low-dimensional geometry.

Time:
May 22, 2018 10:00 AM - 11:30 AM

Paul Arne Østvær will give a talk at the KTH topology seminar on "A motivic Segal conjecture for the group of order two."

Time:
May 14, 2018 -
May 18, 2018

Paul Arne Østvær will speak at the conference Motivic homotopy theory and refined enumerative geometry at the Universität Duisburg-Essen, Essen, Germany on "A motivic Segal conjecture for the group of order two."

Time and place:
May 9, 2018 11:15 AM - 12:00 PM,
Seminar room "End of the Line"

Time and place:
May 3, 2018 1:00 PM - 2:00 PM,
Hurricane, Ullevål

Kurusch Ebrahimi-Fard (NTNU) will give a talk with title: Moment-cumulant relations in noncommutative probability and shuffle-exponentials

Abstract: In this talk we consider monotone, free, and boolean moment-cumulant relations from the shuffle algebra viewpoint. Cumulants are described as infinitesimal characters over a particular combinatorial Hopf algebra, which is neither commutative nor cocommutative. As a result the moment-cumulant relations can be encoded in terms of shuffle and half-shuffle exponentials. These shuffle exponentials and the corresponding logarithms permit to express monotone, free, and boolean cumulants in terms of each other using the pre-Lie Magnus expansion. If time permits we will revisit additive convolution in monotone, free and boolean probability and related aspects. Based on joint work with F. Patras (CNRS).

Time and place:
May 2, 2018 2:15 PM - 4:00 PM,
Gates of Eden, Sognsveien 77 B

In this second talk I will prove the local slice theorem and give examples of applications, discuss compactness properties of instanton moduli spaces, and explain the definition and some properties of instanton homology.

Time and place:
May 2, 2018 11:20 AM - 12:00 PM,
Desolation Row Sognsveien 77 B

In their book "Riemann-Roch Algebra", Fulton and Lang give an account of Chern classes in lambda-rings and a general version of Grothendieck's Riemann-Roch theorem. Their definition of Chern classes is based on the additive formal group law. In work on connective K-theory, Greenlees and I have given an account of Chern classes in lambda-rings based on the multiplicative formal group law. This account has an evident generalization to any formal group law. The course will be an attempt to carry out Fulton and Lang's program in this more general setting. Hoped for applications include generalizations of results relating rational lambda-modules to twisted Dirichlet characters. ---