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Semi-invariant of a quiver

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In the context of representation theory and the study of quivers (directed graphs used to study algebras), a semi-invariant of a quiver refers to a type of polynomial that is associated with the representations of the quiver. Quivers are composed of vertices and arrows (morphisms) between those vertices. A representation of a quiver assigns a vector space to each vertex and a linear map to each arrow.

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