The Gabriel-Roiter measure for $\widetilde{\mathbb{A}}_n$ II

Details The Gabriel-Roiter measure for $\widetilde{\mathbb{A}}_n$ II The Gabriel-Roiter measure for $\widetilde{\mathbb{A}}_n$ II

2009-09-30

arxiv.org/abs/0909.5594v2

Mathematics

Representation Theory

Scientific paper

Let $Q$ be a tame quiver of type $\widetilde{\mathbb{A}}_n$ and $\Rep(Q)$ the category of finite dimensional representations over an algebraically closed field. A representation is simply called a module. It will be shown that a regular string module has, up to isomorphism, at most two Gabriel-Roiter submodules. The quivers $Q$ with sink-source orientations will be characterized as those, whose central parts do not contain preinjective modules. It will also be shown that there are only finitely many (central) Gabriel-Roiter measures admitting no direct predecessors. This fact will be generalized for all tame quivers.

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