Tame roots of wild quivers |
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Authors: | Xiuping Su |
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Institution: | Université de Picardie, LAMFA CNRS UMR 6140, 33 rue St Leu, F-80039 Amiens cedex 1, France |
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Abstract: | We study the tame behaviour of the representations of wild quivers Q via tame roots. A positive root d of Q is called a tame root if d is sincere and for any positive sub-root d′ of d we have q(d′) 0, where q(d′) is the Tits form of Q. We prove that a sincere root is a tame root if and only if for any decomposition of d into a sum of positive sub-roots d=d1+ +ds, there is at most one di with q(di)=0 and q(dj)=1. This is the essential property of a tame root and it is an alternative way to define tame roots. Then we give the canonical decomposition of a tame root. At the end we prove our main result that for any wild graph, there are only finitely many tame roots. |
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Keywords: | Tame root Wild quiver Representation variety Canonical decomposition |
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