  Gromov-Witten invariants of weighted projective planes and Euler
characteristics of moduli spaces of representations of bipartite quivers are
related via the tropical vertex, a group of formal automorphisms of a torus. On
the Gromov-Witten side, this uses the work of Gross, Pandharipande and Siebert.
The quiver moduli side features quiver wall-crossing formulas, functional
equations for Euler characteristics, and localization techniques. We derive
several explicit formulas for Gromov-Witten invariants.
