Mathematics – Representation Theory
Scientific paper
2008-07-28
Duke Math. J., 152(1):27-92, 2010
Mathematics
Representation Theory
42 pages, hyperlinked. Incorporates suggestions from an anonymous referee, notably a proof of Prop. 2 using sheaves, correctio
Scientific paper
10.1215/00127094-2010-006
The free abelian group R(Q) on the set of indecomposable representations of a quiver Q, over a field K, has a ring structure where the multiplication is given by the tensor product. We show that if Q is a rooted tree (an oriented tree with a unique sink), then the ring $R(Q)_{red}$ is a finitely generated $\Z$-module (here $R(Q)_{red}$ is the ring R(Q) modulo the ideal of all nilpotent elements). We will describe the ring $R(Q)_{red}$ explicitly, by studying functors from the category Rep(Q) of representations of Q over K to the category of finite dimensional K-vector spaces. We also present an open problem for future direction.
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