First time blogging with ipad.

Will update more often from now on

## Testing

## Forthcoming event

CIMPA School on Geometric Representation Theory, August 1-12, 2011

### Objectives:

The aim of the School is to train young students in research activity in several areas of Geometric Representation Theory. The proposed topics include areas which are currently very active and the School intends to initiate the students in research by proposing them Research Projects under the supervision of senior researchers involved in the School. The school is going to give sufficient background to provide the students with the necessary tools to start their PhD work. The presence of a large number of mathematicians working in Geometric Representation Theory is going to strengthen the impact of this research discipline in Indonesia. The students coming to the School will come from many parts of the greater region and we intend to use the contacts which are certainly going to be established to build on further networks centering around Geometric Representation Theory in South-East Asia. Further we will use the leading role the mathematical faculty of ITB is already playing in Indonesia to advertise the subject in Indonesia more than it is already.

Geometric representation theory has many different aspects. We will focus on mainly two of them. First, given an algebraic variety with a group acting by homomorphism of varieties on it gives the possibility to use representation theoretic techniques to study the variety as well as the group by means of the action. A particular case appears in the following context. Given a finite dimensional algebra over an algebraically closed field and an integer d, then the representations of the algebra of dimension d are given by matrices satisfying polynomial relations, whence giving a variety. Isomorphism classes are provided by orbits under the conjugation action of the general linear group, and hence the setting is given. The case of the algebra of upper triangular matrices gives flag varieties, a quotient of which is the algebra of complexes of vector spaces. Grassmann varieties appear in this context. A module is said to degenerate to a second module if the second module is in the closure of the adherence of the orbit of the first. An algebraic characterization of this situation has been given. All these aspects are going to be studied in the school and various links between the subjects are going to be explored.

### Organizing committee:

Intan Muchtadi (ITB, Bandung, Indonesia) ntan@math.itb.ac.id

Alexander Zimmermann (Univ. Picardie, France) Alexander.zimmermann@u-picardie.fr

### Date and location:

August 1-12, Institut Teknologi Bandung, Bandung, Indonesia

### Scientific program:

- Grzegorz Bobinski, Faculty of Mathematics and Computer Science, Nicolaus Copernicus University, Torun, Poland “Geometry of Modules over Quasi-titled Algebras”
- Michel Brion, Université de Grenoble I, France “Invariant Hilbert schemes and classification of varieties with reductive group action”
- William Crawley-Boevey, Department of Mathematics, University of Leeds, UK “The Deligne-Simpson Problem”
- Corrado De Concini, Dipartimento di Matematica · Università di Roma, Italy, title and abstract not yet communicated
- Birge Huisgen-Zimmermann, Department of Mathematics, University of California, Santa Barbara, USA “Degenerations of finite dimensional representations”
- V. Lakhsmibai, Department of Mathematics, Northeastern University, USA “Flag Varieties”
- Manuel Saorin, Universidad de Murcia, Spain “Derived and classical Picard groups of a finite dimensional algebra”
- Grzegorz Zwara, Faculty of Mathematics and Computer Science, Nicolaus Copernicus University, Torun, Poland “Geometry of orbit closures in module varieties”

## Some thoughts

Some thoughts from *A Mathematician Apology* by G. H. Hardy, (I often think the same things and some of his thoughts make me feel optimistic) :

… *why is it really worth while to make a serious study of mathematics? [...] And my answer will be, for the most part, such as are to be expected from a mathematician : I think that it is worth while, that there is ample justification*.

*A man who is always asking ‘Is what I do worth while?’ and ‘Am I the right person to do it?’ will always be ineffective himself and a discouragement to others. He must shut his eyes a little and think a little more of his subject and himself than they deserve.*

*A man who sets out to justify his existence and his activities has to distinguish two different questions. The first is whether the work which he does is worth doing; and the second is why he does it, whatever its value may be. [...] Their answers, if they honest, will usually take one or other of two forms [...]
1. I do what I do because it is the one and only thing that I can do at all well. I am a lawyer, or a stockbroker, or a professional cricketer, because I have some real talent for that particular job.
2.There is *nothing

*that I can do particularly well. I do what I do because it came my way. I really never had a chance of doing anything else.*

*I emphasized the permanence of mathematical achievement -*

*What we do may be small, but it has a certain character of permanence; and to have produced anything of the slightest permanent interest, whether it be a copy of verses or a geometrical theorem, is to have done something utterly beyond the powers of the vast majority of men.*

*No discovery of mine has made, or is likely to make, directly or indirectly, for good or ill, the least difference to the amenity of the world. [...] (but) I have added something to knowledge, and helped others to add more; and that these somethings have a value which differs in degree only, and not in kind, from that of the creations of the great mathematicians, or of any of the other artists, great or small, who have left some kind of memorial behind them.*

—

(written on March 16, 2006)