On systems of equations over free partially commutative groups

Using an analogue of Makanin-Razborov diagrams, we give an effective description of the solution set of systems of equations over a partially commutative group (right-angled Artin group) G G . Equivalently, we give a parametrisation of H o m ( G , G ) Hom(G, G) , where G G is a finitely generated group.