  It is well-known that the intersection multiplicities of Schubert classes in
the Grassmanian are Littlewood-Richardson coefficients. We generalize this
statement in the context of quiver representations. Here the intersection
multiplicity of Schubert classes is replaced by the number of
subrepresentations of a general quiver reprsentation, and the
Littlewood-Richardson coefficients are replaced by the the dimension of a
certain space of semiinvariants.
