  The effects of the electron-electron interactions in a graphene layer are
investigated. It is shown that short range couplings are irrelevant, and scale
towards zero at low energies, due to the vanishing of density of states at the
Fermi level. Topological disorder enhances the density of states, and can lead
to instabilities. In the presence of sufficiently strong repulsive
interactions, p-wave superconductivity can emerge.
