Angela Holtmann's English homepage

Angela Holtmann

Address/General information

Education

Publications

Talks

Conferences/Workshops

Teaching

Links

Picture (8/2005)

German version German

Address:	University of Bielefeld	University of Bielefeld
	Faculty of Mathematics	Faculty of Mathematics
	Universitätsstr. 25	Postfach 100 131
	33615 Bielefeld	33501 Bielefeld

Note that I have left the University of Bielefeld as of 1 December, 2009 and that I am now working at the University of Münster at the Faculty of Mathematics and Computer Science (my coordinates at the University of Münster).

Here is a short introduction to my “university life”:

My name is Angela Holtmann and I studied mathematics as a diploma student from October 1994 until July 2000 (with emphasis on representation theory and biology as my second subject) at the University of Bielefeld.

During my diploma studies, I was a member of the students' representatives. Among other things, I was responsible for the lecture evaluations, a member of the committee for tutorials (4 years) and of the faculty's main committee (1 year, and 2 years as a deputy member). Furthermore, I worked in the "Projekt: Studienberatung Online"¹), which was a joint project of the students' representatives from 12 different faculties, in which we wrote a lot of web sites for an online course guidance, some of which still exist.

I wrote my diploma thesis and my PhD thesis in the subject representation theory of finite dimensional algebras with Claus Michael Ringel.

As scientific assistant, I also worked (as the chair) in the committee for tutorials (from October 2003 until October 2006). From October 2006 until June 2008, I was a member of the faculty's main committee, again.

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Education

School
01/08/1981 – 31/07/1985:	Grundschule Enger-Westerenger (primary school)
01/08/1985 – 11/06/1994:	Widukindgymnasium Enger
11/06/1994:	Abitur

University
01/10/1994 – 05/07/2000:	Studies of Mathematics (and Biology), University of Bielefeld
05/07/2000:	Diploma in Mathematics
01/10/2000 – 25/03/2003:	Studies of Mathematics (PhD student), University of Bielefeld
25/03/2003:	PhD in Mathematics

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Publications

Here is a list with some publications, preprints and slides from talks given at various conferences:

Publications and preprints

Diploma thesis: Unterraumendliche Dimensionsvektoren sternförmiger Köcher (12/1999)
(in English: Subspace finite dimension vectors of star-shaped quivers)
PhD thesis: The s-tame dimension vectors for stars (1/2003) (PDF version)
(Here is the link to the official publication at BieSOn (Bielefelder Server für Online-Publikationen) together with the official abstract (both formatted as postscript files).)
The s-tame dimension vectors for stars. J. Algebra 289 (2005), no. 1, 277-311
The tame dimension vectors for stars. J. Pure and Applied Algebra 209 (2007), no. 1, 201-214
The tame dimension vectors for trees. SFB-Preprint 08-084, SFB 701 (2008)
The tame dimension vectors for trees (accepted for publication in Bulletin des Sciences Mathématiques, Dec. 2009)
More counterexamples to Okounkov's log-concavity conjecture (in preparation)

Slides

Multiple Flag Varieties of Tame Type:
The s-tame dimension vectors for stars (PDF)
(& AR-quiver (type E₈) showing the decompositions of the dimension vectors on page 7 of the slides (PDF))
(talk at the ICRA X, Toronto (7/2002))
The s-tame dimension vectors for stars (PDF)
(talk at the “International Conference on Algebras, Modules and Rings”, Lisboa (7/2003))
The tame dimension vectors for stars (PDF)
(talk at the ICRA XI, Pátzcuaro, México (8/2004))
Tame dimension vectors for wild quivers (PDF)
(talk at the ICRA XII, Toruń (8/2007))
Classification of the tame dimension vectors for wild trees and construction of the one parameter families of indecomposable representations (PDF)
(talk at the ICRA XIII, São Paulo (8/2008))

If you are interested in my current research, please send me an

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Talks (outside Bielefeld)

25/07/2002:	Multiple Flag Varieties of Tame Type: The s-tame dimension vectors for stars ICRA X, Toronto (25 minutes)
14/07/2003:	The s-tame dimension vectors for stars “International Conference on Algebras, Modules and Rings”, Lisboa (20 minutes)
30/01/2004:	Dimension vectors of star shaped quivers with one parameter families of subspace representations AG Algebra & Topologie, Basel (90 minutes)
29/04/2004:	The tame dimension vectors for stars and one parameter families of indecomposable representations Oberseminar Darstellungstheorie, Paderborn (60 minutes)
20/08/2004:	The tame dimension vectors for stars ICRA XI, Pátzcuaro, México (25 minutes)
24/08/2007:	Tame dimension vectors for wild quivers ICRA XII, Toruń (20 minutes)
04/08/2008:	Classification of the tame dimension vectors for wild trees and construction of the one parameter families of indecomposable representations ICRA XIII, São Paulo (30 minutes)
30/06/2009:	(More) Counterexamples to Okounkov's log-concavity conjecture Oberseminar Darstellungstheorie von Algebren und algebraischen Gruppen, Köln (60 minutes)
30/11/2009:	(More) Counterexamples to Okounkov's log-concavity conjecture IRTG-Seminar, Paderborn (60 minutes)

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Conferences/Workshops

1998
31/08 – 05/09/1998:	ICRA 8.5 and Euroconference “Infinite Length Modules”, Bielefeld

2000
25/09 – 27/09/2000:	Workshop “Computer Algebra and Representation Theory”, Bielefeld

2001
19/06 – 21/06/2001:	Workshop “Algebraic Groups en Vogue”, Bielefeld

2002
20/02 – 23/02/2002:	TMR-Workshop “Algebraic Lie Representations”, Bielefeld (local organiser)
15/07 – 10/08/2002:	ICRA X (including workshops), Toronto

2003
08/06 – 14/06/2003:	Seminar “Geometry and Combinatorics of Representations of Quivers”, Oberwolfach
27/06 – 29/06/2003:	Workshop “Algebraic Groups, Hecke Algebras and Abstract Representation Theory”, Bielefeld
14/07 – 18/07/2003:	“International Conference on Algebras, Modules and Rings”, Lisboa
11/09 – 17/09/2003:	Conference “Frobenius Algebras and Related Topics”, Toruń
17/10 – 18/10/2003:	Darstellungstheorietage 2003, Jena
06/12/2003:	1. Bielefeld–Paderborn Representation Theory Workshop, Paderborn
08/12 – 13/12/2003:	Workshop “Representations of Finite Dimensional Algebras”, Warwick

2004
10/06/2004:	NWDR-Workshop, Bielefeld (local organiser)
16/07/2004:	NWDR-Workshop “Representation Theory of Finite Groups and Finite Dimensional Algebras”, Hannover
10/08 – 20/08/2004:	ICRA XI (including workshop), México (Querétaro and Pátzcuaro)
	Some problems in representation theory posed at a special session at the ICRA XI
25/09 – 30/09/2004:	Workshop “Interaction of Finite Dimensional Algebras with other areas of Mathematics”, Banff (Pictures)
03/12/2004:	NWDR-Workshop, Münster

2005
04/02 – 05/02/2005:	Conference “Perspectives in Mathematics: Algebras and Representations”, Bielefeld (local organiser)
06/02 – 12/02/2005:	Workshop “Representation Theory of Finite-Dimensional Algebras”, Oberwolfach
	Oberwolfach report for the workshop “Representation Theory of Finite-Dimensional Algebras”: http://www.math.uni-bielefeld.de/~sek/mfo2005/ (local page in Bielefeld) The final version of the report (including the introduction) can be downloaded from the homepage of the workshop at mfo.de.
16/06 – 19/06/2005:	2^nd Joint Meeting of AMS, DMV, and ÖMG, Mainz
01/07/2005:	NWDR-Workshop, Bielefeld (local organiser)
18/07 – 22/07/2005:	Summer School “Representation Theory in Mathematical Physics”, Bad Honnef
25/07 – 26/07/2005:	Miniworkshop “Algebraic Groups, Lie Groups and Transformation Groups”, Bielefeld (Organisers: H. Abels and E. Vinberg)
21/10 – 22/10/2005:	NWDR-Workshop, Paderborn

2006
16/01 – 27/01/2006:	Advanced school and conference on representation theory and related topics, Trieste
17/02/2006:	NWDR-Workshop, Hannover
28/04 – 29/04/2006:	Fifth NRW Topology Meeting, Bielefeld (Organisers: S. Bauer and M. Rost)
25/05 – 27/05/2006:	Workshop “Cluster algebras and cluster tilted algebras”, Bielefeld (local organiser)
07/07 – 08/07/2006:	Workshop “Perspectives in Representation Theory”, Bad Honnef
10/09 – 13/09/2006:	Hermann Weyl Conference, Bielefeld (Organisers: S. Bauer, A. Grigoryan, D. Poguntke, U. Rehmann, M. Rost, and K. Tent)
10/11 – 11/11/2006:	Conference “Representations of Algebras and their Geometry”, Paderborn (some Pictures (by Philipp Fahr))

2007
02/02/2007:	NWDR-Workshop, Wuppertal
22/02 – 23/02/2007:	Workshop “Support Varieties in Representation Theory”, Paderborn
29/04 – 01/05/2007:	Conference “Representations, Cohomology and Support spaces”, Bielefeld (local organiser)
10/05 – 12/05/2007:	Conference “Perspectives in Auslander-Reiten Theory”, Trondheim
18/05 – 19/05/2007:	NWDR-Workshop, Köln
15/08 – 24/08/2007:	ICRA XII (including workshop), Toruń
26/10/2007:	NWDR-Workshop, Düsseldorf

2008
01/05 – 04/05/2008:	Workshop “The Representation Dimension of Artin Algebras”, Bielefeld (local organiser)
05/07/2008:	NWDR-Workshop, Bonn
30/07 – 08/08/2008:	ICRA XIII (including workshop), São Paulo
31/10 – 01/11/2008:	Workshop “The ADE chain”, Bielefeld (local organiser)
14/11/2008:	NWDR-Workshop, Münster
22/11/2008:	Workshop on Nakajima's quiver varieties I, Bonn
06/12/2008:	Workshop on Nakajima's quiver varieties II, Paderborn

2009
17/01/2009:	Workshop on Nakajima's quiver varieties III, Bielefeld (local organiser)
12/02/2009:	Representation Theory Day, Paderborn
02/03 – 06/03/2009:	Workshop on representations and cohomology, Köln
20/04 and 27/04/2009:	Workshop “Highest weight categories arising from algebraic groups”, Bielefeld (local organiser)
26/05 – 30/05/2009:	Workshop “Triangulated Categories and Singularities”, Paderborn (some parts)
10/08 – 14/08/2009:	Conference “Homological and geometric methods in algebra”, Trondheim
25/09/2009:	NWDR-Workshop, Bochum

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Teaching

as a tutor (tutorials)
Winter term 2000/01:	Mathematics for Computer Scientists III (Dr. D. Garbe)
Summer term 2001:	Linear Algebra II (Prof. H. Abels)
Winter term 2001/02:	Mathematics for Computer Scientists I (Dr. D. Garbe)
Summer term 2002:	Mathematics for Computer Scientists II (Dr. D. Garbe)
Winter term 2002/03:	Mathematics for Computer Scientists III (Dr. D. Garbe)
Summer term 2003:	Calculus I (Dr. W. Hoh)

as scientific assistant
Winter term 2003/04:	Seminar Topology: The Hopf Invariant (together with C.M. Ringel)
Summer term 2004:	Seminar Topology: The Stable Homotopy Category (together with C.M. Ringel) Lecture (with tutorials): Mathematics for Bioinformatics II (stochastics and statistics)
Winter term 2005/06:	Proseminar: Reflection groups (together with R. Farnsteiner) Lectures: Selected Topics in Representation Theory (together with C.M. Ringel, R. Farnsteiner and L. Hille) Seminar: Representation theory (together with C.M. Ringel, R. Farnsteiner and L. Hille)
Summer term 2006:	Seminar: Higher Linear Algebra (together with C.M. Ringel, R. Waldmüller and R. Farnsteiner) Lectures: Selected Topics in Representation Theory (together with C.M. Ringel, R. Farnsteiner and R. Waldmüller) Seminar: Representation theory (together with C.M. Ringel, R. Farnsteiner and R. Waldmüller)
Winter term 2006/07:	Lecture with tutorials: Homological algebra with applications to representations of quivers (together with R. Farnsteiner) (Here is a small page with the contents of the “representation theoretic part” of the lecture.) Seminar: Representation theory (together with C.M. Ringel and R. Farnsteiner)
Summer term 2007:	Lecture with tutorials: Homological algebra and representation theory II (together with R. Farnsteiner) (Here is a small page with the contents of the “representation theoretic part” of the lecture.) Seminar: Representation theory (together with C.M. Ringel, R. Farnsteiner and L. Hille)
Winter term 2007/08:	Lecture with tutorials: Symmetry as a fundamental idea (GHR) (together with L. Hille) Lectures: Selected Topics in Representation Theory (together with P. Fahr, R. Farnsteiner and L. Hille) Seminar: Representation theory (together with R. Farnsteiner and L. Hille)
Summer term 2008:	Lecture (with tutorials): Mathematics for biologists, biotechnologists and biochemists Seminar: Representation theory (together with C.M. Ringel and R. Farnsteiner)
Winter term 2008/09:	Seminar: Cryptography (including supervision of a bachelor thesis) Seminar: Representation theory (together with C.M. Ringel and J.M. Bois)
Summer term 2009:	Lecture (with tutorials): Group theory (GHR) Seminar: Representation theory (together with C.M. Ringel)
Winter term 2009/10 (until 30 Nov., 2009):	Lecture (with tutorials): Calculus (GHR) Seminar: Representation theory (together with C.M. Ringel, D. Vossieck, D. Kussin and A. Lopatin)