Tensor invariants of SL(n), wave graphs and L-tris

Aleksandrs Mihailovs
Department of Mathematics
University of Pennsylvania
Philadelphia, PA 19104-6395
http://www.math.upenn.edu/~mihailov/

The space of invariants of a tensor product of representations of SL(n)  
is provided with the basis parametrized by wave graphs introduced here 
especially for this purpose. The proof utilizes a game similar to Tetris,  
named here L-tris.

Preprint (March 2, 1998)