## Visiting address

Ullevål StadionSognsveien 77B

0855 OSLO

Norway

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

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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 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 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:
June 18, 2018 -
June 22, 2018,
Sophus Lie Conference Center, Nordfjordeid, Norway.

Nordfjordeid Summer school 2018

Time and place:
May 16, 2018 12:15 PM - 2:00 PM,
Vilhelm Bjerknes' House, Auditorium 2

This is the third and last lecture by **Anders C. Hansen** (Cambridge Univ. and UiO) on this topic. **Vegard Antun** (UiO) will also contribute to the lecture.

Time and place:
May 15, 2018 10:15 AM - 12:00 PM,
Vilhelm Bjerknes' House, Auditorium 4

This is the second in a series of three lectures by **Anders C. Hansen** (Cambridge Univ. and UiO) on this topic. **Vegard Antun** (UiO) will also contribute to the lectures.

Time and place:
May 14, 2018 12:15 PM - 2:00 PM,
Vilhelm Bjerknes' House, Auditorium 2

This is the first in a series of three lectures by **Anders C. Hansen** (Cambridge Univ. and UiO) on this topic. **Vegard Antun** (UiO) will also contribute to the lectures.

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

Time and place:
May 4, 2018 12:45 PM - 1:45 PM,
Gates of Eden, Sognsv. 77B

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. ---

Time and place:
May 2, 2018 10:15 AM - 11:05 AM,
Desolation Row Sognsveien 77 B

Time and place:
May 2, 2018 9:30 AM -
May 4, 2018 4:30 PM,
Auditorium 2 of the science library building Vilhelm Bjerknes' hus

The third Scandinavian Gathering Around Remarkable Discrete Mathematics

Time and place:
Apr. 25, 2018 1:00 PM - 2:00 PM,
Gates of Eden, Sognsv. 77B

Associate Professor Erik Adli from the Department of Physics at UiO will give a Colloquium Talk on

** Particle Accelerators**

Time and place:
Apr. 20, 2018 1:15 PM,
Ullevål Stadion: Gates of Eden

M.Sc. Torkel Andreas Haufmann ved Matematisk institutt vil forsvare sin avhandling for graden ph.d.:

**Some topics in combinatorial matrix theory and on the k-regular induced subgraph problem**

Time and place:
Apr. 11, 2018 2:15 PM - 4:00 PM,
Desolation Row, Sognsveien 77 B

Waldhausen's algebraic K-theory of spaces is an extension of algebraic K-theory from rings to spaces (or ring spectra) which also encodes important geometric information about manifolds. Bivariant A-theory is a bivariant extension of algebraic K-theory from spaces to fibrations of spaces. In this talk, I will first recall the definition and basic properties of bivariant A-theory and the A-theory Euler characteristic of Dwyer-Weiss-Williams. I will then introduce a bivariant version of the cobordism category and explain how this may be regarded as a universal space for the definition of additive characteristic classes of smooth bundles. Lastly, I will introduce a bivariant extension of the Dwyer-Weiss-Williams characteristic and discuss the Dwyer-Weiss-Williams smooth index theorem in this context. Time permitting, I will also discuss some ongoing related work on the cobordism category of h-cobordisms. This is joint work with W. Steimle.

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

Time and place:
Apr. 9, 2018 1:15 PM,
Ullevål Stadion: Gates of Eden

M.Sc. Rune Vegard Skullerud Fjellbo ved Matematisk institutt vil forsvare sin avhandling for graden ph.d.:

**Non-singular simplicial sets**

Time and place:
Apr. 9, 2018 10:15 AM,
Ullevål Stadion: Gates of Eden

M.Sc. Rune Vegard Skullerud Fjellbo ved Matematisk institutt avholder prøveforelesning over oppgitt emne: "The s-cobordism theorem".

Time and place:
Apr. 9, 2018 10:15 AM,
Ullevål Stadion: Gates of Eden

M.Sc. Torkel Andreas Haufmann ved Matematisk institutt avholder prøveforelesning over oppgitt emne: "Nonnegative factorization rank of a nonnegative matrix".

Time and place:
Apr. 3, 2018 10:30 AM - 12:00 PM,
Gates of Eden

On Tuesday the 3rd of April there will be a presentation on the modern problems facing research data and its use. It is highly recommended that all employees at the Department of Mathematics attend.

The presentation will be held in English.

Time and place:
Mar. 21, 2018 2:15 PM - 4:00 PM,
Desolation Row, Sognsveien 77 B

I will review Witt vectors, KÃ€hler forms and logarithmic rings, and outline how they merge in the logarithmic de Rham-Witt complex. This structure gives an algebraic underpinning for the Hesselholt-Madsen (2003) calculation of logarithmic topological cyclic homology of many discrete valuation rings.