In this article we build a linear representation starting from a multigraph; this allows us to give an algebraic view of the multi-graph we are studying. We show that two isomorphic multi-graphs give equivalent representations ; conversely two equivalent representations give isomorphic multigraphs. For the clarity of the article we give at the beginning, classical results on representations , nevertheless these are specific to our graph representation.
MSC Classification: 05C25 , 20G05 , 20C15