Title: Another combinatorial eigenvalue problem

Time and Location: 26th of November, 2008, 2 p.m.;
           RISC-Seminarroom, Schloss Hagenberg

Abstract:
A problem in algebraic geometry (construction of a family
of abelian varieties with particular symmetry properties,
joint work with E. Izadi, Athens, and H. Lange, Erlangen) was 
solved by proving summation identities. One way of
achieving this is by considering eigenvalues of certain 
differential operators acting on spaces of homogeneous 
polynomials. Equivalently: the eigenvalues are those of matrices 
for counting lattice paths.The non-obvious fact that these 
eigenvalues are simple and are integers extends to two other 
lattice path counting problems.