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Minimal generating set for semi-invariants of quivers of dimension two

A minimal (by inclusion) generating set for the algebra of semi-invariants of a quiver of dimension (2,...,2) is established over an infinite field of arbitrary characteristic. The mentioned generating set consists of the determinants of generic matrices and the traces of tree paths of pairwise different multidegrees, where in the case of characteristic different from two we take only admissible paths. As a consequence, we describe relations modulo decomposable semi-invariants.

preprint2010arXivOpen access
A. A. Lopatin
math.RTmath.AGmath.RA
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A. A. Lopatin

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