## Visiting address

Niels Henrik Abels husMoltke Moes vei 35 (map)

0851 OSLO

Norway

Time and place:
Feb. 16, 2017 2:15 PM–4:00 PM,
B638, NH Abels hus

Time and place:
Feb. 9, 2017 2:15 PM–4:00 PM,
B638, NH Abels hus

Time and place:
Nov. 10, 2016 2:15 PM–4:00 PM,
B638, NH Abels hus

Time and place:
Oct. 27, 2016 2:15 PM–4:00 PM,
B638, NH Abels hus

Time and place:
Oct. 20, 2016 2:15 PM–4:00 PM,
B638, NH Abels hus

Time and place:
Sep. 22, 2016 2:15 PM–4:00 PM,
B638, NH Abels hus

Yuan Wang (Utah), gives the Seminar in Algebra and Algebraic Geometry:

*"On the characterization of abelian varieties for log pairs in zero and positive characteristic"*

Time and place:
Sep. 15, 2016 2:15 PM–4:00 PM,
B638, NH Abels hus

Francesco Galuppi (UiO/Ferrara) gives the algebraic geometry seminar:

"Identifiability of polynomials and Cremona transformations."

Time and place:
Sep. 8, 2016 2:15 PM–4:00 PM,
B738, NH Abels hus

Seckin Adali (UiO), gives the Seminar in Algebra and Algebraic Geometry:

Singularities of Restriction Varieties in OG(k,n)

Time and place:
Sep. 1, 2016 2:15 PM–4:00 PM,
B638, NH Abels hus

Kristian Ranestad (UiO), gives the Seminar in Algebra and Algebraic Geometry:

*"Kummer surfaces and hyperkähler fourfolds, as degeneracy loci"*

Time and place:
June 9, 2016 2:15 PM–4:00 PM,
B738, NH Abels hus

Ritwik Mukherjee (TIFR) gives the Seminar in Algebra and Algebraic Geometry:

**Title: **Enumerative Geometry of singular curves in a Linear System

**Abstract:** Enumerative geometry is a branch of mathematics that deals with the following question: "How many geometric objects satisfy certain constraints". A well known class of enumerative question is to count curves in a linear system H^0(X,L) that have some prescribed singularities. In this talk we will describe a topological method to approach this problem. We will express the enumerative numbers as the Euler class of an appropriate bundle. We will then go on to explain how we compute the degenerate contribution of the Euler class using a topological method.

Time and place:
May 26, 2016 2:15 PM–4:00 PM,
B738, NH Abels hus

John Christian Ottem, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Title: Moduli of K3s via Global Torelli

Abstract: I'll give a brief account of the Torelli theorems and the construction of the moduli space of K3 surfaces

Time and place:
May 19, 2016 2:15 PM–4:00 PM,
B738, NH Abels hus

Alessandro Oneto (Stockholm) gives the Seminar in Algebra and Algebraic Geometry:

**Ideals of points and Waring problems for polynomials**

Time and place:
Apr. 19, 2016 2:15 PM–4:00 PM,
B638, NH Abels hus

Sofia Tirabassi (UiB), gives the Seminar in Algebra and Algebraic Geometry:

**Title: Characterization of product of theta divisors**

Abstract: This is a joint work with Z. Jiang and M. Lahoz. We give a new cohomological characterization of product of theta divisors in principally polarized abelian varieties and we completely classify n-varieities with of maximal albanese dimension and with irregularity 2n-1 and euler characteristic 1, extending lower dimensional results of Hacon--Pardini. I will do my best to keep the first hour enjoyable and entertaining also for graduate students with background in algebraic geometry (and related areas).

Time and place:
Apr. 7, 2016 2:15 PM–4:00 PM,
B738, NH Abels hus

Jørgen Vold Rennemo (Oxford) gives the Seminar in Algebra and Algebraic Geometry:

**K3 surfaces seminar: The moduli spaces of polarized K3 surfaces**

Time and place:
Mar. 31, 2016 2:15 PM–4:00 PM,
B738, NH Abels hus

Arvid Siqveland (HBV), gives the Seminar in Algebra and Algebraic Geometry:

**K3 surfaces seminar: Endomorphism fields and Mumford–Tate groups II**

Time and place:
Mar. 10, 2016 2:15 PM–4:00 PM,
B738, NH Abels hus

Arvid Siqveland (HBV), gives the Seminar in Algebra and Algebraic Geometry:

**K3 surfaces seminar: Endomorphism fields and Mumford–Tate groups**

Time and place:
Mar. 3, 2016 2:15 PM–4:00 PM,
B738, NH Abels hus

Hirokazu Nasu (Tokai University), gives the Seminar in Algebra and Algebraic Geometry:

**Obstructions to deforming curves lying on a K3 surface in a Fano 3-fold**

Abstract

Slides

Time and place:
Feb. 18, 2016 2:15 PM–4:00 PM,
B738, NH Abels hus

Fredrik Meyer (UiO), gives the Seminar in Algebra and Algebraic Geometry:

**K3 surfaces V: Hodge structures**

Time and place:
Feb. 11, 2016 2:15 PM–4:00 PM,
B738, NH Abels hus

Atanas Iliev, Seoul National University, gives the Seminar in Algebra and Algebraic Geometry:

**Verra 3-folds and EPW quartics **

Time and place:
Feb. 4, 2016 2:15 PM–4:00 PM,
B738, NH Abels hus

Andrea Hofmann (HBV) gives the Seminar in Algebra and Algebraic Geometry:

**Minimal resolutions for projective models of K3 surfaces in rational normal scrolls**

Literature used in the seminar are selected chapters in the book «K3 Projective Models in Scrolls» by Trygve Johnsen and Andreas Leopold Knutsen.

Time and place:
Jan. 28, 2016 2:15 PM–4:00 PM,
B738, NH Abels hus

Geir Ellingsrud (UiO), gives the Seminar in Algebra and Algebraic Geometry:

**Projective models of K3-surfaces II**