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arXiv · 1103.5415

Generic decompositions and semi-invariants for string algebras

Witold Kraśkiewicz·Jerzy Weyman
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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 $n\le 6$ the rings of semi-invariants are complete intersections but we show an example for $n=7$ that this is not the case in general.

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BibTeXRIS

Witold Kraśkiewicz, Jerzy Weyman. 2011-03-28. Generic decompositions and semi-invariants for string algebras. https://arxiv.org/abs/1103.5415

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