(Note change of room.) 
 
            TECHNION
 
            DEPARTMENT OF MATHEMATICS
 
                                   ALGEBRA SEMINAR
 
            SPEAKER: Yuval Ginosar, Haifa University
 
            TITLE:   Semi-invariant matrices.
 
            DATE:    Thursday, March 22, 2012
 
            TIME:    13:30
 
            PLACE:   Amado  814 (Note change of room.) 
 
            ABSTRACT:
 
            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 thesemi-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.
 
            A joint work with O. Schnabel.
 
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