Generic decompositions and semi-invariants for string algebras
Representation Theory
2011-03-29 v1 Algebraic Geometry
Rings and Algebras
Abstract
We investigate the rings of semi-invariants for tame string algebras A(n) of non-polynomial growth. We are interested in dimension vectors of band modules. We use geometric technique related to the description of coordinate rings on varieties of complexes. The fascinating combinatorics emerges, showing that our rings of invariants are the rings of some toric varieties. We show that for the rings of semi-invariants are complete intersections but we show an example for that this is not the case in general.
Cite
@article{arxiv.1103.5415,
title = {Generic decompositions and semi-invariants for string algebras},
author = {Witold Kraśkiewicz and Jerzy Weyman},
journal= {arXiv preprint arXiv:1103.5415},
year = {2011}
}