Tidligere arrangementer - Side 34

In this talk we define a new category of matroids, by working on matroid polytopes and rank preserving weak maps. This lets us introduce the concept of categorical valuativity for functors, which can be seen as a categorification of the ordinary valuativity for matroid invariants.

We also show that this new theory agrees with what we know about valuative polynomials: several known valuative polynomials can be seen as a Hilbert series of some graded vector space and we prove that these graded vector spaces let us define a valuative functor in the new sense. 

Lastly, we sketch how to categorify a Theorem by Ardila and Sanchez, which states that the convolution of two valuative invariants (respectively, valuative functors) is again valuative.

This is based on a joint ongoing project with Ben Elias, Dane Miyata and Nicholas Proudfoot.

In this talk we define a new category of matroids, by working on matroid polytopes and rank preserving weak maps. This lets us introduce the concept of categorical valuativity for functors, which can be seen as a categorification of the ordinary valuativity for matroid invariants.

We also show that this new theory agrees with what we know about valuative polynomials: several known valuative polynomials can be seen as a Hilbert series of some graded vector space and we prove that these graded vector spaces let us define a valuative functor in the new sense. 

Lastly, we sketch how to categorify a Theorem by Ardila and Sanchez, which states that the convolution of two valuative invariants (respectively, valuative functors) is again valuative.

This is based on a joint ongoing project with Ben Elias, Dane Miyata and Nicholas Proudfoot.

In this talk we define a new category of matroids, by working on matroid polytopes and rank preserving weak maps. This lets us introduce the concept of categorical valuativity for functors, which can be seen as a categorification of the ordinary valuativity for matroid invariants.

We also show that this new theory agrees with what we know about valuative polynomials: several known valuative polynomials can be seen as a Hilbert series of some graded vector space and we prove that these graded vector spaces let us define a valuative functor in the new sense. 

Lastly, we sketch how to categorify a Theorem by Ardila and Sanchez, which states that the convolution of two valuative invariants (respectively, valuative functors) is again valuative.

This is based on a joint ongoing project with Ben Elias, Dane Miyata and Nicholas Proudfoot.

How sickled cells remember: Genetics as embodied history in Tanzania.

Thomas Mohnike (University of Strasbourg) will lecture about the transnational geographies of a Norwegian national poet between 1890 and 1918.

C*-algebra seminar by Ali Miller (Southern University of Denmark)

Speaker: Camilla Aukrust, Institute of Health and Society, UiO

Unni Fuskeland, Cosmology and Extragalactic Astronomy research group, Institute of Theoretical Astrophysics, University of Oslo.

In this final seminar, Kari-Elisabeth Vambeseth Skogen will present the draft of her PhD thesis titled "The use of research in policy: A study of how civil servants engage with research knowledge".

Senter for tverrfaglig kj?nnsforskning inviterer kolleger og venner til v?rt ?rlige nytt?rsselskap. Det blir nytt?rsforedrag ved forfatter Anna Blix, mat og drikke, og utdeling av pris for beste masteroppgave med kj?nnsperspektiv.

Guest Speakers: Dr Edwin Ameso, Leipzig University and Dr Lena Kroeker, University of Bayreuth

By Yves Scherrer (IFI).

C*-algebra seminar by Emilie Elki?r (University of Oslo)

Department seminar. Morten H?varstein is a Doctoral Research Fellow at the Department of Economics, University of Oslo. He will present the paper: "Meritocratic Labor Income Taxation" (written with Kristoffer Berg and Magnus Stubhaug).

Oslo Stability and Enumerative Geometry Workshop 2023

Department seminar. Gaurab Aryal is an Associate Professor at the Department of Economics, Washington University in St. Louis. He will present the paper: "Auctioning Annuities" (written with Eduardo Fajnzylber, Maria F. Gabrielli, Manuel Willington). 

C*-algebra seminar by Gaute Schwartz (University of Oslo)

Stine Engen is a PhD candidate at the TIK Centre for Technology, Innovation and Culture. This seminar marks her midway evaluation.

Department seminar. Lars Thorvaldsen is a Lecturer at the Department of Economics, University of Oslo. He will present the paper: "Reassessing the Tax Sensitivity of Debt in Multinational Corporations."

Seminaret unders?ker kj?nnede forestillinger fra polaromr?denes kultur- og vitenskapshistorie gjennom presentasjoner og en panelsamtale. 

A peculiarity of nonlinear hyperbolic problems is that they must be interpreted as limits of second-order equations with vanishing viscosity. Despite not explicitly being present in the hyperbolic case, diffusion is needed, e. g., at discontinuities or to avoid the occurrence of nonphysical states. In the case of gas dynamics, for instance, dissipation corresponds to the production of thermodynamic entropy. To solve hyperbolic problems numerically, one needs to adapt these ideas to the discrete setting. Standard high-order methods, however, do not incorporate the appropriate amounts of artificial viscosity because these need to be chosen adaptively based on the solution. Among the high-resolution schemes capable of doing so are the recently proposed monolithic convex limiting (MCL) techniques [1] to be discussed in this talk. They offer a way to enforce physical admissibility, entropy stability, and discrete maximum principles for conservation laws. These methods can also be generalized to systems of balance laws in a well-balanced manner [2]. In addition to second-order finite element methods, extensions to high-order discontinuous Galerkin (DG) schemes shall also be presented [3]. Numerical examples for the so-called KPP problem, the nonconservative shallow water system, and the compressible Euler equations will be shown. An overview of MCL and other property-preserving methods can be found in our recently published book [4].