ABSTRACT: In this talk, based on joint work with Harm Derksen, I discuss a generalization of our previous results on rings semi-invariants of quivers. We proved that such rings are generated by determinantal semi-invariants
c^V of Schofield (parametrized by indecomposable representations V). For quivers with relations  we look at indecomposable representations V  of projective dimension at most one. For such representations we define
semi-invariants c^V and prove that they generate rings of semi-invariants.

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For further information visit the Seminar web site at http://www.northeastern.edu/martsinkovsky/p/rtrt.html  or contact Alex Martsinkovsky <alexmart@neu.edu>