# Seminars in Algebra

## Fall 2001

## November 29th 2001, 14:15 - 16:00 in Rom 546

**Title:** A new grading on the preprojective algebra of a\n quiver II

**Speaker:** Mark Kleiner

## November 22nd 2001, 14:15 - 16:00 in Rom 546

**Title:** A new grading on the preprojective algebra of a quiver

**Speaker:** Mark Kleiner

## November 6th 2001, 15:15 - 17:00 in Rom 546

**Title:** Cotilting in tubes

**Speaker:** Aslak Buan

## November 1st 2001

**Title:** Algebras of infinite global dimension have an indec. module of both infinite proj. and inj. dim.

**Speaker:** Sverre O. Smalø

## October 18th 2001

**Title:** A generalization of Koszul modules II

**Speaker:** Dan Zacharia

## October 16th 2001

**Title:** Codes over Z_4: The "duality" of Kerdock Codes and Preparata Codes

**Speaker:** Henk van Tilborg

## October 8th 2001

**Title:** A generalization of Koszul modules

**Speaker:** Dan Zacharia

## September 27th 2001

**Title:** Torsion theories

**Speaker:** Idun Reiten

## September 25th 2001

**Title:** Finiteness of the representation dimension

**Speaker:** Sverre O. Smalø

## September 23rd 2001

**Title:** Piecewise hereditary algebras

**Speaker:** Dieter Happel

## September 23rd 2001

**Title:** Selfinjective Koszul algebras

**Speaker:** Dan Zacharia

## September 22nd 2001

**Title:** Representations of graded Lie s-algebras with sl(3)xsl(2)xgl(1) as the zero degree component

**Speaker:** Alexei Rudakov

## September 22nd 2001

**Title:** 2-torus, Möbius band, Klein bottle, and their non-commutative friends

**Speaker:** Helmut Lenzing

## September 22nd 2001

**Title:** Some properties of minimal degenerations of quiver representations

**Speaker:** Klaus Bongartz

## September 22nd 2001

**Title:** Homologically finite subcategories, torsion theories and closed model structures

**Speaker:** Apostolos Beligiannis

## September 21st 2001

**Title:** Filtering modules of finite homological dimension

**Speaker:** Henning Krause

## September 21st 2001

**Title:** Direct products of modules and the pure semi-simplicity conjecture

**Speaker:** Birge Huisgen-Zimmermann

## September 21st 2001

**Title:** On tame algebras and Tits form

**Speaker:** Thomas Brüstle

## September 21st 2001

**Title:** Derived categories and Euler form

**Speaker:** Andrzej Skowronski

## September 18th 2001

**Title:** Some remarks on H^1.

**Speaker:** Dieter Happel

## September 13th 2001

**Title:** Systems and limits of pure injective cotilting modules

**Speaker:** Aslak Buan

## September 11th 2001

**Title:** The genus of a graph of tilting modules

**Speaker:** Luise Unger

## September 6th 2001

**Title:** The geometry of chain complexes and outer automorphisms under derived equivalences

**Speaker:** Birge Huisgen-Zimmermann

## September 4th 2001

**Title:** Infinitesimal groups with tame principal block

**Speaker:** Andrzej Skowronski

## August 30th 2001

**Title:** The Hochschild cohomology ring of a selfinjective algebra of finite representation type

**Speaker:** Øyvind Solberg

## August 28th 2001

**Title:** Subgroups of finite abelian groups

**Speaker:** Claus M. Ringel

## August 23rd 2001

**Title:** Hereditary noetherian categories with a commutative function field

**Speaker:** Helmut Lenzing

## August 21st 2001

**Title:** The Deligne-Simpson problem and weighted projective lines

**Speaker:** William Crawley-Boevey

## Spring 2001

## June 7th 2001

**Title:** Representasjoner av quiver og deres geometri

**Speaker:** Anita Valenta

## June 1st 2001

**Title:** Irreducible components of varieties of modules II

**Speaker:** Jan Schröer

## May 23rd 2001

**Title:** Irreducible components of varieties of modules

**Speaker:** Jan Schröer

## May 11th 2001

**Title:** Hereditære kategorier med tilte-objekt over vilkårlige kropper

**Speaker:** Idun Reiten

## May 8th 2001

**Title:** Inverse grenser av sekvenser av kotilte-moduler

**Speaker:** Aslak Buan

## April 3rd 2001

**Title:** Torsion theories and model categories

**Speaker:** Apostolos Beligiannis

## March 29th 2001

**Title:** Torsion theories in pretriangulated categories

**Speaker:** Apostolos Beligiannis

## March 27th 2001

**Title:** Cohomological operators, support varieties and Hochschild cohomology rings

**Speaker:** Øyvind Solberg

## March 20th 2001

**Title:** Filtrering av moduler av endelig projektiv dimensjon II

**Speaker:** Øyvind Solberg

## March 13th 2001

**Title:** Filtrering av moduler av endelig projektiv dimensjon

**Speaker:** Øyvind Solberg