25. August 
Olav Arnfinn Laudal (Oslo)
Noncommutative deformation theory, algebraic geometry, quantum fields and quarks, I

1. September 
Olav Arnfinn Laudal (Oslo)
Noncommutative deformation theory, algebraic geometry, quantum fields and quarks, II

8. September 
Olav Arnfinn Laudal (Oslo)
Noncommutative deformation theory, algebraic geometry, quantum fields and quarks, III

15. September 
Ragni Piene (Oslo)
Classifying smooth lattice polytopes via toric fibrations I
Abstract:
Let P be a convex ndimensional lattice polytope in R^n. Its
codegree is the smallest integer m such that mP has interior lattice
points. Cayley polytopes are examples of polytopes with large codegree.
In a joint work with A. Dickenstein and S. Di Rocco we partially answer
a question of Batyrev and Nill, by showing that all smooth Qnormal
polytopes with codegree at least (n+3)/2 are strict Cayley polytopes.
Our proof relies on the study of the nef value and the nef value map of
a nonsingular polarized toric variety (X,L).

22. September 
Ragni Piene (Oslo)
Classifying smooth lattice polytopes via toric fibrations II

29. September 
Algebra lunch

6. October 
Algebra lunch

13. October 
David Rydh (KTH, Stockholm)
Families of cycles
Abstract:
The Chow variety, parameterizing cycles on a projective space, was
introduced by Chow and van der Waerden in 1937 but its functorial aspects
are still not well understood. In this talk I will define, in any
characteristic, a functor parameterizing cycles which is closely related
to the Chow variety. It (conjecturally in some cases) generalizes the
functorial descriptions of Barlet, Ang\'eniol, Guerra, Koll\'ar and
SuslinVoevodsky. It also explains related work by Mumford and Fogarty.

20. October 
Edoardo Sernesi (Roma)
The curve of lines on a Fano 3fold of genus 8
Abstract:
I will report on joint work with F. Flamini in which we
prove a variant of Torelli's theorem for Fano 3folds of genus 8
based on the geometry of the curve of lines on the 3fold.

27. October 
Kristian Ranestad (Oslo)
Toric polar Cremona transformations

30.31. October 
Nasjonalt algebramøte

3. November 
Algebra lunch

10. November  David Eklund (KTH,
Stockholm) Algebraic C*actions and homotopy
continuation Abstract: Let X be a smooth projective
variety over C equipped with a C*action whose fixed points are
isolated. Let Y and Z be subvarieties of X of complementary dimensions
in X. I will present a method for approximating the isolated points of
intersection between Y and Z based on homotopy continuation and the
BialynickiBirula decompositions of X into locally closed invariant
subsets. The method was developed with applications to mechanics in
mind and I will explain how it gives a new solution to the inverse
kinematic problem of a socalled sixrevolute seriallink mechanism.

17. November  Arne B. Sletsjøe (Oslo)
Deformasjoner under bibetingelser

24. November 
Algebra lunch

1. December 
Algebra lunch

8.9. December, B63 
Lutefiskseminars in B63 (both days):
Monday 8.:
11.45: Algebra lunch (6.etg NHA)
12.15: Dan Laksov (KTH) Splitting algebraer
Sammendrag: Vi gir definisjoner, konstruksjoner, og egenskaper
til splitting algebraer.
13.15: Stephanie Yang (KTH)
Fabertype conjectures on moduli spaces of curves
Abstract:
In this talk I will review Faber's conjectures and known
results concerning tautological rings of moduli spaces of curves, and
describe recent attempts to extend these to other moduli spaces.
19.30: Dinner, Rorbua (Aker Brygge) Lutefisk/juletallerken
Tuesday 9.:
10.15: Sandra Di Rocco (KTH)
Some results on reducible hyperplane sections
Abstract:
A cone with vertex a point in projective space has the
property that every hyperplane section
through the vertex is reducible.
How restrictive is to ask that given an (ample and spanned) linear
system L on
a variety X, there is at least a point, x, such that all elements
passing through x are reducible or non reduced?
The possibilities are indeed very limited, X is a surface and it is
mapped by L to a cone. This is work of Bertni, BesanaDi RoccoLanteri
and LanteriDe Fernex.
I will report on some recent work, with BesanaLanteri, concerning
linear systems whose elements passing through higher degree zeroschemes
are reducible.
In particular how big can the locus of such "bad zeroschemes" be in the
appropriate Hilbert scheme?
11.15:Roy Skjelnes (KTH)
Parameterizing distinct points in a variety.
Abstract:
Let H denote the Hilbert scheme parameterizing n points on a
separated algebraic space X over an arbitrary base space. Using sheaf
theoretical methods it is easy to construct the open subspace U of H
parameterizing distinct points. However, by studying the space U locally
one obtains, surprisingly enough, information about how distinct points
degenerates. This information can be used to construct the schematic
closure of U in H, which in fact was done recently in a joint work with
David Rydh. 