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Semi-Invariant Matrices

Dr. Yuval Ginosar

Dr. Yuval Ginosar / University of Haifa, Israel and Indiana University

The semi-invariants of a module-algebra over a group G are the elements in its 1-dimensional constituents. These elements span a subalgebra, called the semi-center, which is graded by the linear characters of G. By studying the projective representations of G, we describe the semi-center of matrix algebras, or more generally of artinian semi-simple G-module-algebras.Joint work with O. Schnabel

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